Initial commit

24 files changed, 3095 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b3702a0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+clockrotz
+clockrotz.iml
+README.html
+.idea
diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
new file mode 100644
index 0000000..437070f
--- /dev/null
+++ b/Godeps/Godeps.json
@@ -0,0 +1,34 @@
+{
+	"ImportPath": "github.com/githubert/clockrotz",
+	"GoVersion": "go1.5.4",
+	"Deps": [
+		{
+			"ImportPath": "github.com/davecgh/go-spew/spew",
+			"Rev": "5215b55f46b2b919f50a1df0eaa5886afe4e3b3d"
+		},
+		{
+			"ImportPath": "github.com/docopt/docopt.go",
+			"Comment": "0.6.2",
+			"Rev": "784ddc588536785e7299f7272f39101f7faccc3f"
+		},
+		{
+			"ImportPath": "github.com/go-ini/ini",
+			"Comment": "v1.11.0",
+			"Rev": "12f418cc7edc5a618a51407b7ac1f1f512139df3"
+		},
+		{
+			"ImportPath": "github.com/jordan-wright/email",
+			"Comment": "v2.2-9-gfd70310",
+			"Rev": "fd703108daeb23d77c124d12978e9b6c4f28f034"
+		},
+		{
+			"ImportPath": "github.com/pmezard/go-difflib/difflib",
+			"Rev": "792786c7400a136282c1664665ae0a8db921c6c2"
+		},
+		{
+			"ImportPath": "github.com/stretchr/testify/assert",
+			"Comment": "v1.1.3-16-g6cb3b85",
+			"Rev": "6cb3b85ef5a0efef77caef88363ec4d4b5c0976d"
+		}
+	]
+}
diff --git a/Godeps/Readme b/Godeps/Readme
new file mode 100644
index 0000000..4cdaa53
--- /dev/null
+++ b/Godeps/Readme
@@ -0,0 +1,5 @@
+This directory tree is generated automatically by godep.
+
+Please do not edit.
+
+See https://github.com/tools/godep for more information.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.asciidoc b/README.asciidoc
new file mode 100644
index 0000000..8c344fa
--- /dev/null
+++ b/README.asciidoc
@@ -0,0 +1,469 @@
+= Clockrotz
+Clemens Fries <github-clockrotz@xenoworld.de>
+:source-highlighter: pygments
+:toc: left
+:clockrotz-ini: clockrotz.ini
+:clockrotz-base: clockrotz
+:version: 0.0.1
+
+Clockrotz v{version} — a simple email notification helper.
+
+IMPORTANT: This program is in development and might have some rough edges. The
+documentation on `master` should still accurately reflect the current state of
+the program.
+
+== What is `clockrotz`?
+
+`clockrotz` is a “note to my future self” email notification tool. You write a
+simple text file, with some metadata, and it will, upon invocation, send a
+message when the time has come.
+
+.Example message
+----
+to: me@example.com
+subject: Watch Halley's Comet
+date: 2061-07-28
+
+Greetings!
+
+Go outside at night, if the curfew of the – highly welcomed — alien overlords
+permits, and watch Halley's Comet.
+----
+
+=== Motivation
+
+I needed a fairly simple tool to send some one-off reminders to myself, and
+possibly to others. Plus, I wanted the messages to live in my home directory,
+so I would not forget them if I move to another server. You could realize
+most of this with `atd`, but it is a bit clumsy if want to quickly write a
+message, plus I'd totally forget to copy `/var/spool/at`.
+
+`clockrotz` is not meant to be a daemon. It should be executed regularly by a
+cron job or other method. For the `date` parameter it also supports having a
+specific time, which acts as a “not before” constraint. If you run your cron
+job often enough (for example: every five minutes) the message will, of course,
+be sent very close to the given time.
+
+
+== Quick Start
+
+=== Building
+
+In order to check out and build the project in its own directory in `/tmp`,
+write the following:
+
+[source,shell]
+----
+cd $(mktemp -d)
+export GOPATH=$PWD
+git clone http://github.com/githubert/clockrotz src/github.com/githubert/clockrotz
+cd src/github.com/githubert/clockrotz
+godep get
+go build
+----
+
+=== Running
+
+Create `.config/{clockrotz-ini}`:
+[source,ini]
+----
+[default]
+server = smtp.example.com
+user = me
+password = aengeequ6xeiseoY
+from = me@example.com
+----
+
+Create a new message:
+----
+clockrotz create --to me@example.com
+----
+
+Add a cron job:
+----
+0 6 * * * /path/to/clockrotz run
+----
+
+List messages due in the next days:
+----
+clockrotz next
+----
+
+Run manually:
+----
+clockrotz run
+----
+
+== Quick Start Walkthrough
+
+Create a file `.config/{clockrotz-ini}` and provide a server, credentials and a
+from address:
+
+[source,ini]
+----
+[default]
+server = smtp.example.com
+user = me
+password = aengeequ6xeiseoY
+from = me@example.com
+----
+
+NOTE: `port` defaults to `587`. If it doesn't work, try setting `port` to
+`25`.
+
+Now ready some message to yourself:
+
+----
+clockrotz create --to me@example.com
+----
+
+This will open a new file using the editor set in the `VISUAL` environment
+variable, or if no editor is set, it will default to `vi`.
+
+Fill in `date` in the format `YYYY-mm-dd` (for example `date: 2016-01-01`) and
+add a meaningful `subject`. Add a blank line between the configuration in the
+header and your message's body.
+
+Save and exit the editor. `clockrotz` will ask you what to do. Press `ENTER` to
+save the message to the `{clockrotz-base}/todo` folder.
+
+If you set `date` to today's date you can test if everything works. First check
+if everything is okay by running `clockrotz check`, if it reports no errors,
+you can see with `clockrotz next` if the message is scheduled for being sent
+out in the next seven days.
+
+Finally, if you type `clockrotz run`, it will deliver all messages that were
+due.
+
+As `clockrotz` is not a daemon, you should run it daily by adding it as a cron
+job.
+
+Type `crontab -e` and add a entry to run the command every day at 6 in the
+morning:
+
+----
+0 6 * * * /path/to/clockrotz run
+----
+
+== Folder structure
+
+The default working directory is `clockrotz`, located in the user's home
+directory. There are several folders created beneath it, when the program
+is invoked.
+
+----
+clockrotz/
+  todo/
+  done/
+  errors/
+  drafts/
+----
+
+`todo/` is the message queue. All `.msg` files in that folder are considered
+when running `clockrotz run`.
+
+`done/` contains all messages that were successfully delivered. For every
+message there is also a corresponding `.log` file.
+
+`errors/` contains all messages that could not be delivered. For every message
+there is also a corresponding `.log` file.
+
+`drafts/` contains messages that can be used with `clockrotz create --draft
+FILENAME`. Additionally, messages in this folder will also be checked with
+`clockrotz check`.
+
+== Global Settings File `.config/{clockrotz-ini}`
+
+Global settings can be put into the optional file `.config/{clockrotz-ini}`.
+
+All _global_ settings can also be overridden on the command line.
+
+`.config/{clockrotz-ini}` is a simple ini-style settings file with a `default`
+section, plus optional sections for every command, in order to overrule the
+settings in the `default` section.
+
+.Example file
+[source,ini]
+----
+[default]
+workdir = ~/clockrotz
+server = smtp.example.com
+port = 587
+from = me@example.com
+
+[run]
+bcc = me@example.com
+----
+
+=== Settings
+
+NOTE: Empty values are valid and mean that a setting has been un-set.
+
+==== Global and Command Line
+
+workdir:: The working directory, defaults to `~/clockrotz`.
+server:: Address of the SMTP server. Defaults to `localhost`.
+port:: Port of the SMTP server. Defaults to the SMTP submission port `587`.
+not-before:: Do not sent messages before the specified time. (`00:00` until `not-before`)
+not-after:: Do not sent messages after the specified time. (`not-after` until `23:59`)
+
+TODO: not-after / not-before warrant some better explanation
+
+Priority of these is as follows `command line > global`.
+
+==== Global, Command Line and as Configuration
+
+These parameters are valid everywhere and may also be included in the
+configuration part of a message.
+
+NOTE: `date` is not allowed anywhere except in the message configuration.
+
+from:: `from` as in <<Configuration>>
+to:: `to` as in <<Configuration>>
+cc:: `cc` as in <<Configuration>>
+bcc:: `bcc` as in <<Configuration>>
+subject:: `subject` as in <<Configuration>>
+reply-to:: `reply-to` as in <<Configuration>>
+
+Priority of these is as follows `configuration > command line > global`.
+
+== Message format
+
+Messages consist of two parts *separated by a single empty line*. The first part
+is the configuration and the second part is the actual message.
+
+.Example message
+----
+to: cryogenics-department@example.com
+from: me-bot@example.com
+cc: me@example.com
+subject: Unfreeze Clemens
+date: 2134-01-01
+
+Dear Cryogenics Department,
+
+please unfreeze Clemens, as he wanted to watch this year's close pass of
+Halley's Comet. This one is going to have an apparent magnitude of -2.0 — it's
+gonna be fun, so feel free to join him!
+----
+
+
+[[Configuration]]
+=== Configuration
+
+The following parameters are permitted, everything else is going to be ignored.
+
+==== Required parameters
+
+NOTE: Except for `date`, other required parameters may be specified outside the
+message configuration, either on the command line or in the ini-file.
+
+date:: The "not before" date. This may either be a simple date in the format
+`YYYY-mm-dd`, which will be interpreted as `YYYY-mm-dd 00:00`, or a date with a
+time in the form of `YYYY-mm-dd HH:MM`.
+
+to:: A single address to where the message will be sent. It may either be a
+simple email address such as `foo@example.net` or an address including a
+name such as `Foo bar <foo@example.net>`.
+
+subject:: A short subject.
+
+from:: Same format as `to`.
+
+==== Optional parameters
+
+cc:: Same format as `to`, but multiple comma-separated entries are allowed,
+works like `Cc` in email.
+
+bcc:: Same format as `to`, but multiple comma-separated entries are allowed,
+works like `Bcc` in email.
+
+reply-to:: Same format as `to`, works like `Reply-To` in email.
+
+=== Message Body
+
+Simple, plain text. It is assumed to be in UTF-8, though.
+
+== Writing a New Message
+
+Either edit a file, directly in `{clockrotz-base}/todo`, or use the command line tool
+to initialize an empty message and start your favourite editor. The file name
+must end in `.msg`, otherwise it will be ignored.
+
+.Using the command line tool
+----
+$ clockrotz create --to "foo@example.com"
+----
+
+== Command Line Options
+
+Use `--help` after any command to get the full help message shown.
+
+----
+include::clockrotz.go[tag=main]
+----
+
+=== `next` command
+
+----
+include::cmd/next.go[tag=next]
+----
+
+This will show which messages are going to be sent within the next 7 days. Use
+the `--days` parameter to change how many days in advance are processed. If you
+use the `--all` parameter, all pending messages will be listed.
+The format is simply `date  subject (filename)`.
+
+----
+$ clockrotz next --all
+Showing all messages.
+
+2061-07-28 00:00  Watch Halley's Comet (halley.msg)
+2134-01-01 00:00  Unfreeze Clemens (unfreeze.msg)
+----
+
+
+=== `run` command
+
+----
+include::cmd/run.go[tag=run]
+----
+
+This will send out all pending messages. There will be no output, unless there
+were errors. Any message that could not be sent will be moved to the `errors`
+folder, and a corresponding `.log`-file will be created with all available
+information; additionally, the program will start to complain at every
+invocation that there were messages with errors. Messages that were delivered
+successfully are moved to the `done` folder and a corresponding `.log`-file is
+created there, too.
+
+
+=== `create` command
+
+----
+include::cmd/create.go[tag=create]
+----
+
+The `create` command will assist you in creating a new message. It will open a
+new file for you, filled in with any parameters you provided on the command
+line. If you provide a file name through the `--draft` parameter, it will
+create a new file based on the given file name in the `drafts` folder.
+
+----
+clockrotz create --to foo@example.com --subject "Something"
+----
+
+It will use the editor configured in `$VISUAL` or `$EDITOR` or `vi`, if the
+former are empty.
+
+`date` will be set to tomorrow's date.
+
+----
+1 to: foo@example.com
+2 subject: Something
+3 date: 2016-01-01
+4
+5 Add message to the world of tomorrow here.
+~
+~
+~
+~
+ INSERT >> [No Name][+]               <<<
+-- INSERT --
+----
+
+After editing it will ask you if you want to add the message to the `todo`
+folder.
+
+----
+Save message? ([(y)es], (d)raft, (n)o):
+----
+
+Answering `n` or `no` will discard the message, answering `d` or `draft` will
+add it to the `drafts` folder. If you type `y`, `yes`, or simply hit `ENTER` it
+will be added to the `todo` folder.
+
+
+=== `check` command
+
+----
+include::cmd/check.go[tag=check]
+----
+
+The `check` command will check all messages in the `todo` and `drafts` folder
+and report any messages that can't be processed. Optionally a file name can be
+provided to check only the given file. It will exit with a code of `0` if no
+errors were found, otherwise with a code of `1`.
+
+NOTE: `--silent` will not suppress output of errors, such as problems loading a
+file.
+
+----
+$ clockrotz check
+
+in drafts:
+ foo.msg:
+    missing the 'to' parameter
+    missing the 'subject' parameter
+
+in todo:
+ bar.msg:
+    'date' parameter is invalid
+----
+
+=== `debug` command
+
+----
+include::cmd/debug.go[tag=debug]
+----
+
+The `debug` command will print out the effective configuration for a message,
+plus the email message.  This shows all settings as they are seen at that
+point. Note that this also shows settings — such as `workdir` and `config` —
+that cannot be overridden by the message. Please note that for the email
+message there are several places, such as the `Message-Id`, that vary from
+invocation to invocation as they are randomly generated.
+
+----
+$ clockrotz debug clockrotz/todo/2061.msg
+Configuration
+-------------
+config: /home/me/.config/config.ini
+date: 2061-07-28
+days: 7
+from: me@example.com
+not-after: 23:59
+not-before: 00:00
+port: 578
+server: smtp.example.com
+subject: Watch Halley's Comet
+to: me@example.com
+workdir: /home/me/clockrotz
+
+Email message
+-------------
+Content-Type: multipart/mixed;
+ boundary=8bb4fce665d20481a3b832ef74a12123edadb7b1bc4d5b505c93e9fbd9e2
+To: <me@example.com>
+Subject: Watch Halley's Comet
+Message-Id: <1464969109987565122.18908.793296386389602001@smtp.example.com>
+From: me@example.com
+Date: Fri, 03 Jun 2016 17:51:49 +0200
+Mime-Version: 1.0
+
+--8bb4fce665d20481a3b832ef74a12123edadb7b1bc4d5b505c93e9fbd9e2
+Content-Type: multipart/alternative;
+ boundary=70b52bfb5fa8b90ebe2b3b9373f62436d412ae3e59bbfa20685dbc1bd6bc
+
+--70b52bfb5fa8b90ebe2b3b9373f62436d412ae3e59bbfa20685dbc1bd6bc
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: quoted-printable
+
+Greetings!
+
+Go outside at night, if the curfew of the – highly welcomed — alien overlords
+permits, and watch Halley's Comet.
+--70b52bfb5fa8b90ebe2b3b9373f62436d412ae3e59bbfa20685dbc1bd6bc--
+
+--8bb4fce665d20481a3b832ef74a12123edadb7b1bc4d5b505c93e9fbd9e2--
+----
diff --git a/clockrotz.go b/clockrotz.go
new file mode 100644
index 0000000..a88353a
--- /dev/null
+++ b/clockrotz.go
@@ -0,0 +1,197 @@
+/* clockrotz.go: main program
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package main
+
+import (
+	"fmt"
+	"github.com/docopt/docopt.go"
+	"os"
+	"os/user"
+	"path/filepath"
+	"github.com/githubert/clockrotz/cmd"
+	. "github.com/githubert/clockrotz/common"
+)
+
+
+var usageMain =
+// tag::main[]
+`
+Usage:
+  clockrotz [options] <command> [<args>...]
+
+Options:
+  --workdir=WORKDIR  Working directory, defaults to $HOME/clockrotz
+  --config=CONFIG    Use the given INI file instead of .config/clockrotz.ini
+  --help             Show this help.
+
+The following commands are available:
+  next    Show messages due in the next days.
+  check   Check if a message is complete.
+  debug   Print the effective configuration for a message, and the resulting
+          email message.
+  create  Open a new message in an editor.
+  run     Send out pending messages.
+` // end::main[]
+
+var defaultConf = Configuration{
+	Data: map[string]string{
+		CONF_DAYS:        "7",
+		CONF_SMTP_PORT:   "587",
+		CONF_SMTP_SERVER: "localhost",
+		CONF_NOT_BEFORE:  "00:00",
+		CONF_NOT_AFTER:   "23:59",
+	},
+}
+
+
+// Retrieve the user's home directory.
+func userHome() string {
+	u, err := user.Current()
+
+	// I don't think we can go on without finding the user's home directory
+	if err != nil {
+		panic(err)
+	}
+
+	return u.HomeDir
+}
+
+// Retrieve the user's config home, which is either defined through the environment variable
+// `XDG_CONFIG_HOME` or is assumed to be a folder called `.config` in the user's home
+// directory (as retrieved by `userHome()`).
+func configHome() string {
+	value, present := os.LookupEnv("XDG_CONFIG_HOME")
+
+	configHome := value
+
+	if !present || value == "" || !filepath.IsAbs(value) {
+		configHome = filepath.Join(userHome(), ".config")
+	}
+
+	return configHome
+}
+
+// Expand `~/`, if the working directory begins with it.
+func expandTilde(conf *Configuration) {
+	workdir := conf.Get(CONF_WORKDIR)
+
+	if len(workdir) > 1 && workdir[0:2] == "~/" {
+		conf.Set(CONF_WORKDIR, filepath.Join(userHome(), workdir[2:]))
+	} else if len(workdir) == 1 && workdir == "~" {
+		conf.Set(CONF_WORKDIR, userHome())
+	}
+}
+
+// This will create all necessary folders in the working directory.
+func createFolders(workdir string) error {
+	for _, dir := range []string{DIR_TODO, DIR_DONE, DIR_ERRORS, DIR_DRAFTS} {
+		err := os.MkdirAll(filepath.Join(workdir, dir), 0777)
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// Complain about files in DIR_ERRORS.
+func alertIfErrors(workdir string) {
+	errorsDir := filepath.Join(workdir, DIR_ERRORS)
+
+	count := 0
+
+	filepath.Walk(errorsDir, func(_ string, info os.FileInfo, _ error) error {
+		if info.Mode().IsRegular() {
+			count++
+		}
+
+		return nil
+	})
+
+	if count > 0 {
+		fmt.Println("There were failed messages.")
+		fmt.Printf("Please inspect the contents of the %s/ directory.\n", DIR_ERRORS)
+	}
+}
+
+func main() {
+	userHome := userHome()
+
+	// This is the configuration that will be cobbled together from the
+	// default configuration ('defaultConf'), the INI and the command line
+	// arguments.
+	sessionConf := NewConfiguration()
+
+	sessionConf.MergeWith(&defaultConf)
+
+	args, _ := docopt.Parse(usageMain, nil, true, "", true)
+
+	// Determine configuration file name, defaults to `clockrotz.ini` in
+	// the user's config home (usually `.config`).
+	if args["--config"] != nil {
+		sessionConf.Set(CONF_CONFIG_FILENAME, args["--config"].(string))
+	} else {
+		sessionConf.Set(CONF_CONFIG_FILENAME, filepath.Join(configHome(), "clockrotz.ini"))
+	}
+
+	// Determine the desired command (run, next, ...)
+	command := args["<command>"].(string)
+
+	// Load INI configuration. This will merge the '[default]' section with
+	// the optional section named after the desired command ('cmd').
+	sessionConf.MergeWithIni(command)
+
+	// Determine working directory, defaults to the folder `clockrotz` in
+	// the user's home directory. '--workdir' on the command line takes
+	// precedence over the 'workdir' in the INI.
+	if args["--workdir"] != nil {
+		sessionConf.Set(CONF_WORKDIR, args["--workdir"].(string))
+	} else {
+		// If no working directory is set in the INI...
+		if sessionConf.Get(CONF_WORKDIR) == "" {
+			sessionConf.Set(CONF_WORKDIR, filepath.Join(userHome, "clockrotz"))
+		}
+	}
+
+	// Expand the `~/` in workdir.
+	expandTilde(sessionConf)
+
+	// Make sure that all necessary folders exist.
+	createFolders(sessionConf.Get(CONF_WORKDIR))
+
+	// See if there are files in DIR_ERRORS and alert the user.
+	alertIfErrors(sessionConf.Get(CONF_WORKDIR))
+
+	commandArgs  := []string{command}
+	commandArgs = append(commandArgs, args["<args>"].([]string)...)
+
+	switch command {
+	case "next":
+		cmd.Next(commandArgs, sessionConf)
+	case "create":
+		cmd.Create(commandArgs, sessionConf)
+	case "check":
+		cmd.Check(commandArgs, sessionConf)
+	case "run":
+		cmd.Run(commandArgs, sessionConf)
+	case "debug":
+		cmd.Debug(commandArgs, sessionConf)
+	}
+}
\ No newline at end of file
diff --git a/clockrotz_test.go b/clockrotz_test.go
new file mode 100644
index 0000000..325438c
--- /dev/null
+++ b/clockrotz_test.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+	. "github.com/githubert/clockrotz/common"
+)
+
+func TestExpandTilde(t *testing.T) {
+	c := NewConfiguration()
+
+	c.Set(CONF_WORKDIR, "/foo")
+	expandTilde(c)
+	assert.Equal(t, "/foo", c.Get(CONF_WORKDIR))
+
+	c.Set(CONF_WORKDIR, "~/foo")
+	expandTilde(c)
+	assert.Equal(t, userHome() + "/foo", c.Get(CONF_WORKDIR))
+
+	// Shortest possible
+	c.Set(CONF_WORKDIR, "~/")
+	expandTilde(c)
+	assert.Equal(t, userHome(), c.Get(CONF_WORKDIR))
+
+	// Single character workdir with only a tilde
+	c.Set(CONF_WORKDIR, "~")
+	expandTilde(c)
+	assert.Equal(t, userHome(), c.Get(CONF_WORKDIR))
+
+	// Ignored tilde
+	c.Set(CONF_WORKDIR, "~test")
+	expandTilde(c)
+	assert.Equal(t, "~test", c.Get(CONF_WORKDIR))
+}
\ No newline at end of file
diff --git a/cmd/check.go b/cmd/check.go
new file mode 100644
index 0000000..2b7316e
--- /dev/null
+++ b/cmd/check.go
@@ -0,0 +1,131 @@
+/* check.go: check a given message for problems
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package cmd
+
+import (
+	"fmt"
+	"github.com/docopt/docopt.go"
+	. "github.com/githubert/clockrotz/common"
+	"os"
+	"path/filepath"
+	"sort"
+)
+
+var usageCheck =
+// tag::check[]
+`
+Usage:
+  clockrotz check [--silent] [FILE]
+
+Options:
+  --silent  Suppress output, useful for silent checks.
+  FILE      Check only the given file.
+
+If no FILE is provided, check will inspect all messages in the todo/ and the
+drafts/ folder. The command exit with a code of 0, if there were no problems.
+` // end::check[]
+
+func Check(argv []string, conf *Configuration) {
+	args, _ := docopt.Parse(usageCheck, argv, true, "", false)
+
+	silent := args["--silent"].(bool)
+
+	ok := true
+
+	if args["FILE"] != nil {
+		message, err := NewMessageFromFile(args["FILE"].(string))
+
+		if err != nil {
+			fmt.Printf("Error while reading message: %s\n", err.Error())
+			os.Exit(1)
+		}
+
+		message.Conf.MergeWith(conf)
+		ok = checkMessage(message, silent)
+	} else {
+		draftOk := checkFolder(DIR_DRAFTS, conf, silent)
+
+		if !silent {
+			// A bit of space between the drafts/ and todo/ listing
+			fmt.Println()
+		}
+
+		todoOk := checkFolder(DIR_TODO, conf, silent)
+
+		ok = draftOk && todoOk
+	}
+
+	if ok {
+		os.Exit(0)
+	} else {
+		os.Exit(1)
+	}
+}
+
+// Inspect all messages in a folder.
+func checkFolder(folder string, conf *Configuration, silent bool) bool {
+	messages := NewMessagesFromDirectory(filepath.Join(conf.Get(CONF_WORKDIR), folder))
+	sort.Sort(Messages(messages))
+
+	if !silent {
+		fmt.Printf("in %s:\n", folder)
+	}
+
+	ok := true
+	count := 0
+
+	for _, message := range messages {
+		count++
+		message.Conf.MergeWith(conf)
+
+		if !checkMessage(message, silent) {
+			ok = false
+		}
+	}
+
+	if ok && !silent {
+		fmt.Printf(" All (%d) messages are valid.\n", count)
+	}
+
+	return ok
+}
+
+// Check the given message. If `silent` is false, all problems will be printed
+// to stdout.
+func checkMessage(message Message, silent bool) bool {
+	ok := true
+	errs := message.Verify()
+
+	if errs != nil {
+		ok = false
+	}
+
+	if silent {
+		return ok
+	}
+
+	if !ok {
+		fmt.Printf(" %s:\n", message.Name)
+
+		for _, err := range errs {
+			fmt.Printf("  %s\n", err.Error())
+		}
+	}
+
+	return ok
+}
diff --git a/cmd/create.go b/cmd/create.go
new file mode 100644
index 0000000..3d02bc7
--- /dev/null
+++ b/cmd/create.go
@@ -0,0 +1,212 @@
+/* create.go: help creating a new message
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package cmd
+
+import (
+	"bufio"
+	"fmt"
+	"github.com/docopt/docopt.go"
+	. "github.com/githubert/clockrotz/common"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+var usageCreate =
+// tag::create[]
+`
+Usage:
+  clockrotz create [--draft=FILE] [options]
+
+Options:
+  --help           Show this help.
+  --to=ADDR        Destination address.
+  --from=ADDR      Sender address.
+  --subject=ADDR   Short subject.
+  --cc=ADDR        Set "Cc".
+  --bcc=ADDR       Set "Bcc".
+  --reply-to=ADDR  Set "Reply-To".
+  --draft=FILE     Use FILE from the drafts/ folder as template.
+` // end::create[]
+
+func Create(argv []string, conf *Configuration) {
+	args, _ := docopt.Parse(usageCreate, argv, true, "", false)
+
+	tmpFile, err := ioutil.TempFile("", "clockrotz")
+
+	if err != nil {
+		fmt.Printf("Error while creating temporary file: %s\n", err.Error())
+		os.Exit(1)
+	}
+
+	// We close the file right away, because we need only its soulless
+	// shell, mwhaha.
+	tmpFile.Close()
+
+	draftsDir := filepath.Join(conf.Get(CONF_WORKDIR), DIR_DRAFTS)
+	todoDir := filepath.Join(conf.Get(CONF_WORKDIR), DIR_TODO)
+
+	defer os.Remove(tmpFile.Name())
+
+	message := NewMessage()
+
+	if args["--draft"] != nil {
+		draft := filepath.Join(draftsDir, args["--draft"].(string))
+		m, err := NewMessageFromFile(draft)
+
+		if err != nil {
+			fmt.Printf("Error while reading draft: %s\n", err.Error())
+			os.Exit(1)
+		}
+
+		message = &m
+	}
+
+	message.Conf.MergeWithDocOptArgs(CMD_USAGE, &args)
+
+	// MergeWithDocOptArgs will also copy --draft and --help over, but we do not want
+	// that.
+	delete(message.Conf.Data, "draft")
+	delete(message.Conf.Data, "help")
+
+	if message.Get("date") == "" {
+		// Add tomorrow's date.
+		message.Conf.Set("date", time.Now().AddDate(0, 0, 1).Format(DATE_FORMAT))
+	}
+
+	if message.Get("subject") == "" {
+		message.Conf.Set("subject", "Type subject here")
+	}
+
+	if len(message.Body) == 0 {
+		message.Body = append(message.Body, "Add message to the world of tomorrow here.")
+	}
+
+	message.WriteToFile(tmpFile.Name())
+
+	editor := editor()
+
+	fmt.Printf("Opening %s using %s.\n", tmpFile.Name(), editor)
+
+	cmd := exec.Command(editor, tmpFile.Name())
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Run()
+
+	if cmd.ProcessState.Success() {
+		fmt.Printf("\nSave message? ([(y)es], (d)raft, (n)o): ")
+		reader := bufio.NewReader(os.Stdin)
+		response, err := reader.ReadString('\n')
+
+		if err != nil {
+			fmt.Printf("Error when reading response: %s\n", err.Error())
+			os.Exit(1)
+		}
+
+		var dst string
+
+		saved := false
+
+		response = strings.TrimSpace(response)
+
+		switch response {
+		case "y", "yes", "":
+			dst = filepath.Join(todoDir, filepath.Base(tmpFile.Name())+".msg")
+			dst, err = copyFile(tmpFile.Name(), dst, false)
+			saved = true
+		case "d", "draft":
+			dst = filepath.Join(draftsDir, filepath.Base(tmpFile.Name())+".msg")
+			dst, err = copyFile(tmpFile.Name(), dst, false)
+			saved = true
+		}
+
+		if err != nil {
+			fmt.Printf("Error when saving %s: %s\n", dst, err)
+		} else if saved {
+			fmt.Printf("Saved as: %s\n", dst)
+		} else {
+			fmt.Println("Discarding message.")
+		}
+	}
+}
+
+// Copy file from `src` to `dst`. If `overwrite` is false, then an alternative
+// file name will be used and returned as string.
+// TODO: Portability issues (cp) / https://github.com/golang/go/issues/8868
+func copyFile(src, dst string, overwrite bool) (string, error) {
+	if !overwrite {
+		var err error
+
+		dst, err = nextFreeFilename(dst)
+
+		if err != nil {
+			return "", err
+		}
+	}
+
+	err := exec.Command("cp", "-f", src, dst).Run()
+
+	return dst, err
+}
+
+func nextFreeFilename(dst string) (string, error) {
+	_, e := os.Stat(dst)
+
+	// If the file does not exist, we can use the name
+	if os.IsNotExist(e) {
+		return dst, nil
+	}
+
+	alt := ""
+
+	for i := 0; i < 255; i++ {
+		name := fmt.Sprintf("%s.%d", dst, i)
+		_, e := os.Stat(name)
+
+		if os.IsNotExist(e) {
+			alt = name
+			break
+		}
+	}
+
+	if alt == "" {
+		return "", fmt.Errorf("No suitable file name could be found.")
+	}
+
+	return alt, nil
+}
+
+func editor() string {
+	editor := os.Getenv("VISUAL")
+
+	if editor != "" {
+		return editor
+	}
+
+	editor = os.Getenv("EDITOR")
+
+	if editor != "" {
+		return editor
+	}
+
+	return "vi"
+}
diff --git a/cmd/create_test.go b/cmd/create_test.go
new file mode 100644
index 0000000..388ce36
--- /dev/null
+++ b/cmd/create_test.go
@@ -0,0 +1,41 @@
+/* create_test.go: unit tests for 'create' command
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package cmd
+
+import (
+	"fmt"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestEditor(t *testing.T) {
+	os.Setenv("VISUAL", "")
+	os.Setenv("EDITOR", "")
+
+	assert.Equal(t, "vi", editor())
+
+	os.Setenv("EDITOR", "editor")
+	assert.Equal(t, "editor", editor())
+
+	os.Setenv("VISUAL", "visual")
+	assert.Equal(t, "visual", editor())
+}
\ No newline at end of file
diff --git a/cmd/debug.go b/cmd/debug.go
new file mode 100644
index 0000000..03f529b
--- /dev/null
+++ b/cmd/debug.go
@@ -0,0 +1,73 @@
+/* debug.go: show debug information for a provided message
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package cmd
+
+import (
+	"fmt"
+	"github.com/docopt/docopt.go"
+	. "github.com/githubert/clockrotz/common"
+	"os"
+)
+
+var usageDebug =
+// tag::debug[]
+`
+Usage:
+  clockrotz debug FILENAME
+
+Options:
+  --help    Show this help.
+  FILENAME  File name of the message to inspect.
+` // end::debug[]
+
+func Debug(argv []string, conf *Configuration) {
+	args, _ := docopt.Parse(usageDebug, argv, true, "", false)
+
+	message, err := NewMessageFromFile(args["FILENAME"].(string))
+
+	if err != nil {
+		fmt.Printf("Error while reading file: %s\n", err.Error())
+		os.Exit(1)
+	}
+
+	fmt.Println("Configuration\n-------------")
+
+	message.Conf.MergeWith(conf)
+
+	for _, line := range message.Conf.DumpConfig() {
+		fmt.Println(line)
+	}
+
+	// TODO: Verify Message?
+	e, err := prepareEmail(&message)
+
+	if err != nil {
+		fmt.Println(err.Error())
+		os.Exit(1)
+	}
+
+	m, err := e.Bytes()
+
+	if err != nil {
+		fmt.Println(err.Error())
+		os.Exit(1)
+	}
+
+	fmt.Println("\nEmail message\n-------------")
+	fmt.Println(string(m))
+}
diff --git a/cmd/next.go b/cmd/next.go
new file mode 100644
index 0000000..f62aad2
--- /dev/null
+++ b/cmd/next.go
@@ -0,0 +1,91 @@
+/* next.go: show upcoming messages
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package cmd
+
+import (
+	"fmt"
+	"github.com/docopt/docopt.go"
+	. "github.com/githubert/clockrotz/common"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"time"
+)
+
+var usageNext =
+// tag::next[]
+`
+Usage:
+  clockrotz next [--days=DAYS | --all]
+
+Options:
+  --help       Show this help.
+  --days=DAYS  List messages for the next DAYS days. (default: 7)
+  --all        List all pending messages.
+` // end::next[]
+
+func Next(argv []string, conf *Configuration) {
+	args, _ := docopt.Parse(usageNext, argv, true, "", false)
+
+	if args["--days"] != nil {
+		conf.Set("days", args["--days"].(string))
+	}
+
+	days, err := strconv.ParseInt(conf.Get(CONF_DAYS), 10, 0)
+
+	if err != nil {
+		fmt.Println("Error while parsing value of --days")
+		return
+	}
+
+	all := args["--all"].(bool)
+
+	future := buildTime(time.Now().AddDate(0, 0, int(days)), 23, 59, false)
+
+	messages := NewMessagesFromDirectory(filepath.Join(conf.Get(CONF_WORKDIR), DIR_TODO))
+	sort.Sort(messages)
+
+	if all {
+		fmt.Printf("Showing all messages.\n\n")
+	} else {
+		fmt.Printf("Showing messages before %s.\n\n", future.Format(DATETIME_FORMAT))
+	}
+
+	count := 0
+
+	for _, message := range messages {
+		message.Conf.MergeWith(conf)
+
+		if errs := message.Verify(); errs != nil {
+			fmt.Printf("Error in message \"%s\". Please run 'clockrotz check'.\n", message.Name)
+			continue
+		}
+
+		// Errors are caught already by Verify()
+		messageDate, _ := ParseTime(message.Get(CONF_DATE))
+
+		if all || messageDate.Before(future) {
+			count++
+			fmt.Printf("%s  %s (%s)\n", messageDate.Format(DATETIME_FORMAT), message.Get(CONF_SUBJECT), message.Name)
+		}
+	}
+
+	if count == 0 {
+		fmt.Println("No messages.")
+	}
+}
diff --git a/cmd/run.go b/cmd/run.go
new file mode 100644
index 0000000..4ba7b16
--- /dev/null
+++ b/cmd/run.go
@@ -0,0 +1,316 @@
+/* run.go: send pending messages
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package cmd
+
+import (
+	"crypto/tls"
+	"fmt"
+	"github.com/docopt/docopt.go"
+	. "github.com/githubert/clockrotz/common"
+	"github.com/jordan-wright/email"
+	"net/mail"
+	"net/textproto"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+var usageRun =
+// tag::run[]
+`
+Usage:
+  clockrotz run [options]
+
+Options:
+  --help             Show this help.
+  --to=ADDR          Destination address.
+  --from=ADDR        Sender address.
+  --subject=ADDR     Short subject.
+  --cc=ADDR          Set "Cc".
+  --bcc=ADDR         Set "Bcc".
+  --reply-to=ADDR    Set "Reply-To".
+  --not-before=TIME  Not before TIME. (default: 00:00)
+  --not-after=TIME   Not after TIME. (default: 23:59)
+  --server=HOST      SMTP hostname. (default: localhost)
+  --port=PORT        SMTP port. (default: 587)
+  --verbose          Report on successfully sent messages.
+  --dry-run          Do not send the message.
+  --insecure         Accept any TLS certificate.
+` // end::run[]
+
+func Run(argv []string, conf *Configuration) {
+	args, _ := docopt.Parse(usageRun, argv, true, "", false)
+	conf.MergeWithDocOptArgs(CMD_RUN, &args)
+
+	verbose := args["--verbose"].(bool)
+	dryRun := args["--dry-run"].(bool)
+	insecure := args["--insecure"].(bool)
+
+	now := time.Now()
+
+	notBeforeTime, err := time.Parse(TIME_FORMAT, conf.Get(CONF_NOT_BEFORE))
+
+	if err != nil {
+		fmt.Printf("Failed parsing not-before time: %s\n", err.Error())
+		return
+	}
+
+	notAfterTime, err := time.Parse(TIME_FORMAT, conf.Get(CONF_NOT_AFTER))
+
+	if err != nil {
+		fmt.Printf("Failed parsing not-after time: %s\n", err.Error())
+		return
+	}
+
+	notBefore := buildTime(now, notBeforeTime.Hour(), notBeforeTime.Minute(), true)
+	notAfter := buildTime(now, notAfterTime.Hour(), notAfterTime.Minute(), false)
+
+	// Return if we are in some quiet period.
+	if now.After(notAfter) || now.Before(notBefore) {
+		return
+	}
+
+	messages := NewMessagesFromDirectory(filepath.Join(conf.Get(CONF_WORKDIR), DIR_TODO))
+
+	verificationError := false
+
+	for _, message := range messages {
+		message.Conf.MergeWith(conf)
+		err := processMessage(message, now, dryRun, insecure, verbose)
+
+		if err != nil {
+			verificationError = true
+			continue
+		}
+	}
+
+	if verificationError {
+		// FIXME: This suggests that other messages were not sent, but they were....
+		fmt.Println("There were errors when verifying one or more messages.")
+		fmt.Println("Please run 'clockrotz check'")
+		os.Exit(1)
+	}
+}
+
+func processMessage(message Message, now time.Time, dryRun, insecure, verbose bool) error {
+	if errs := message.Verify(); errs != nil {
+		return fmt.Errorf("Message %s failed verification.", message.Name)
+	}
+
+	date, err := ParseTime(message.Get("date"))
+
+	if err != nil {
+		return err
+	}
+
+	if !now.After(date) {
+		return nil
+	}
+
+	sendErr := sendMessage(message, dryRun, insecure)
+
+	if sendErr != nil {
+		if !dryRun {
+			err := moveMessage(message, DIR_ERRORS)
+
+			if err != nil {
+				fmt.Printf("Error when moving message %s: %s\n", message.Name, err.Error())
+			}
+
+			logMessage(message, DIR_ERRORS, sendErr.Error())
+		}
+
+		fmt.Printf("Error when sending message %s: %s\n", message.Name, sendErr.Error())
+	} else {
+		if !dryRun {
+			err := moveMessage(message, DIR_DONE)
+
+			if err != nil {
+				fmt.Printf("Error when moving message %s: %s\n", message.Name, err.Error())
+			}
+
+			logMessage(message, DIR_DONE, "Successfully delivered.")
+		}
+
+		if verbose {
+			fmt.Printf("Message %s delivered.\n", message.Name)
+		}
+	}
+
+	return nil // TODO: what about errors that are not verification errors?
+}
+
+func logMessage(message Message, dir string, logMessage string) {
+	dstDir := filepath.Join(message.Get(CONF_WORKDIR), dir)
+	filename := filepath.Join(dstDir, message.Name[:len(message.Name)-len(".msg")]+".log")
+
+	f, err := os.Create(filename)
+
+	if err != nil {
+		fmt.Printf("Error when creating log file: %s\n", err.Error())
+		return
+	}
+
+	defer f.Close()
+
+	f.WriteString("Log message:\n")
+	f.WriteString(fmt.Sprintf("  %s\n", logMessage))
+	f.WriteString("\n")
+
+	f.WriteString("\nConfiguration:\n")
+	for _, s := range message.Conf.DumpConfig() {
+		f.WriteString(fmt.Sprintf("  %s\n", s))
+	}
+
+	f.WriteString("\nBody:\n")
+	for _, s := range message.Body {
+		f.WriteString(fmt.Sprintf("  %s\n", s))
+	}
+}
+
+// Turn the given plain address list string into an array.
+func getAddresses(addressList string) ([]string, error) {
+	addresses, err := mail.ParseAddressList(addressList)
+
+	if err != nil {
+		return nil, err
+	}
+
+	result := []string{}
+
+	for _, address := range addresses {
+		result = append(result, address.String())
+	}
+
+	return result, nil
+}
+
+// Prepare a ready-to-send Email message.
+func prepareEmail(message *Message) (*email.Email, error) {
+	e := email.NewEmail()
+	e.From = message.Get(CONF_FROM)
+	e.Subject = message.Get(CONF_SUBJECT)
+
+	// Build list of To addresses.
+	to, err := getAddresses(message.Get(CONF_TO))
+
+	if err != nil {
+		return nil, err
+	}
+
+	e.To = to
+
+	// Set optional Reply-To header.
+	if r := message.Get(CONF_REPLY_TO); r != "" {
+		replyTo, err := getAddresses(r)
+
+		if err != nil {
+			return nil, err
+		}
+
+		e.Headers = textproto.MIMEHeader{"Reply-To": replyTo}
+	}
+
+	// Build list of Cc addresses.
+	if r := message.Get(CONF_CC); r != "" {
+		cc, err := getAddresses(r)
+
+		if err != nil {
+			return nil, err
+		}
+
+		e.Cc = cc
+	}
+
+	// Build list of Bcc addresses.
+	if r := message.Get(CONF_BCC); r != "" {
+		bcc, err := getAddresses(r)
+
+		if err != nil {
+			return nil, err
+		}
+
+		e.Bcc = bcc
+	}
+
+	e.Text = []byte(strings.Join(message.Body, "\n"))
+
+	return e, nil
+}
+
+// Send the given message, unless `dryRun` is true. Use `insecure` to work
+// around things like self-signed certificates.
+func sendMessage(message Message, dryRun bool, insecure bool) error {
+	e, err := prepareEmail(&message)
+
+	if err != nil {
+		return err
+	}
+
+	smtpServer := message.Get(CONF_SMTP_SERVER) + ":" + message.Get(CONF_SMTP_PORT)
+
+	if dryRun {
+		fmt.Printf("Skip sending message %s through %s.\n", message.Name, smtpServer)
+		return nil
+	}
+
+	if insecure {
+		return e.SendWithTLS(smtpServer, nil, &tls.Config{InsecureSkipVerify: true})
+	} else {
+		return e.Send(smtpServer, nil)
+	}
+}
+
+// Move the given message to a folder relative to the working directory.
+func moveMessage(message Message, relative string) error {
+	todo := filepath.Join(message.Get(CONF_WORKDIR), DIR_TODO)
+	to := filepath.Join(message.Get(CONF_WORKDIR), relative)
+
+	// FIXME: BUG: This will overwrite existing messages. Look at create.go:nextFreeFilename()
+	//             for ideas on how to resolve this. We could try to use a similar approach.
+	//             `foo.msg` to `foo.1.msg` and `foo.1.log`.
+
+	return os.Rename(filepath.Join(todo, message.Name), filepath.Join(to, message.Name))
+}
+
+// Build a time.Time from some given base time. If floor is true, seconds will
+// be set to 0, if false, 59.
+// TODO: Maybe there is a better way?…
+func buildTime(base time.Time, hour int, minute int, floor bool) time.Time {
+	seconds := 0
+
+	if !floor {
+		// We ignore the possibility of leap seconds here, this is
+		// just done so that we can get 23:59:59 instead of 23:59:00.
+		// 23:59:00 would make us miss a whole minute. It would be
+		// nice if there were a way to indicate to time.Date() to
+		// build a date with start of the day / end of the day...
+		seconds = 59
+	}
+
+	return time.Date(
+		base.Year(),
+		base.Month(),
+		base.Day(),
+		hour,
+		minute,
+		seconds,
+		0,
+		base.Location())
+}
diff --git a/cmd/run_test.go b/cmd/run_test.go
new file mode 100644
index 0000000..2c405e9
--- /dev/null
+++ b/cmd/run_test.go
@@ -0,0 +1,39 @@
+/* run_test.go: unit tests for 'run' command
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package cmd
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+	"time"
+)
+
+func TestBuildTime(t *testing.T) {
+	h := 8
+	m := 30
+
+	t1 := buildTime(time.Now(), h, m, true)
+
+	assert.Equal(t, t1.Hour(), 8)
+	assert.Equal(t, t1.Minute(), 30)
+	assert.Equal(t, t1.Second(), 0)
+
+	t2 := buildTime(time.Now(), h, m, false)
+
+	assert.Equal(t, t2.Second(), 59)
+}
diff --git a/common/configuration.go b/common/configuration.go
new file mode 100644
index 0000000..2948116
--- /dev/null
+++ b/common/configuration.go
@@ -0,0 +1,142 @@
+/* configuration.go: module for managing message properties
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package common
+
+import (
+	"fmt"
+	"github.com/go-ini/ini"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+type Configuration struct {
+	Data map[string]string
+}
+
+func NewConfiguration() *Configuration {
+	return &Configuration{
+		Data: map[string]string{},
+	}
+}
+
+func (c *Configuration) Get(key string) string {
+	return c.Data[key]
+}
+
+func (c *Configuration) Set(key string, value string) {
+	c.Data[key] = value
+}
+
+// Load configuration from an array of strings in the form `key: value`.
+func (c *Configuration) Load(text []string) {
+	c.Data = map[string]string{}
+
+	for _, line := range text {
+		r := strings.SplitN(line, ":", 2)
+
+		key := strings.TrimSpace(r[0])
+
+		if len(r) == 2 {
+			c.Data[key] = strings.TrimSpace(r[1])
+		} else {
+			if key != "" {
+				c.Data[key] = ""
+			}
+		}
+	}
+}
+
+// Merge the `src` configuration into this configuration.
+func (c *Configuration) MergeWith(src *Configuration) {
+	for k, v := range (*src).Data {
+		(*c).Data[k] = v
+	}
+}
+
+// Merge arguments from a INI section into the given map.
+func mergeIniSection(section *ini.Section, dst *map[string]string) {
+	for _, k := range section.KeyStrings() {
+		(*dst)[k] = section.Key(k).String()
+	}
+}
+
+// Merges the "default" and the "cmd" section from CONF_CONFIG_FILENAME.
+func (c *Configuration) MergeWithIni(cmd string) {
+	cfg, err := ini.Load(c.Get(CONF_CONFIG_FILENAME))
+
+	if err == nil {
+		section, err := cfg.GetSection("default")
+
+		if err == nil {
+			mergeIniSection(section, &c.Data)
+		}
+
+		section, err = cfg.GetSection(cmd)
+
+		if err == nil {
+			mergeIniSection(section, &c.Data)
+		}
+	}
+}
+
+// Merge arguments from the DocOpt parser into a configuration map. All
+// arguments that are not `nil` and start with "--" will be merged.
+// Booleans will be converted to strings.
+func (c *Configuration) MergeWithDocOptArgs(cmd string, args *map[string]interface{}) {
+	for k, v := range *args {
+
+		// The args list contains the name of the command, but we are not
+		// interested in it.
+		if k == cmd {
+			continue
+		}
+
+		// Merge all args that start with -- and where the value is not nil
+		if v != nil && (len(k) > 2 && k[0:2] == "--") {
+			switch v.(type) {
+			case string:
+				c.Data[k[2:]] = v.(string)
+			case bool:
+				c.Data[k[2:]] = strconv.FormatBool(v.(bool))
+			}
+
+		}
+	}
+}
+
+// Dump the configuration as strings in the form `key: value`.
+func (c *Configuration) DumpConfig() []string {
+	keys := make([]string, len(c.Data))
+
+	i := 0
+	for k, _ := range c.Data {
+		keys[i] = k
+		i++
+	}
+
+	sort.Strings(keys)
+
+	result := make([]string, len(keys))
+
+	for i, k := range keys {
+		result[i] = fmt.Sprintf("%s: %s", k, c.Get(k))
+	}
+
+	return result
+}
diff --git a/common/configuration_test.go b/common/configuration_test.go
new file mode 100644
index 0000000..dbf2697
--- /dev/null
+++ b/common/configuration_test.go
@@ -0,0 +1,105 @@
+/* configuration_test.go: unit tests for the configuration module
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package common
+
+import (
+	"github.com/go-ini/ini"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestConfiguration_MergeWith(t *testing.T) {
+	src := Configuration{
+		Data: map[string]string{
+			"port":   "1",
+			"server": "example.com",
+		},
+	}
+
+	dst := Configuration{
+		Data: map[string]string{
+			"server":  "example.net",
+			"workdir": "/home/foo",
+		},
+	}
+
+	expected := map[string]string{
+		"port":    "1",
+		"server":  "example.com",
+		"workdir": "/home/foo",
+	}
+
+	dst.MergeWith(&src)
+
+	assert.Equal(t, expected, dst.Data)
+}
+
+func TestConfiguration_MergeWithIni(t *testing.T) {
+	dst := map[string]string{
+		"port":   "1",
+		"server": "example.com",
+	}
+
+	iniContents := []byte(`
+	[foo]
+	port = 1234
+	workdir = /home/foo
+	`)
+
+	expected := map[string]string{
+		"port":    "1234",
+		"server":  "example.com",
+		"workdir": "/home/foo",
+	}
+
+	cfg, _ := ini.Load(iniContents)
+
+	section := cfg.Section("foo")
+
+	mergeIniSection(section, &dst)
+
+	assert.Equal(t, expected, dst)
+}
+
+func TestConfiguration_Load(t *testing.T) {
+	text := []string{
+		"to: me@example.com",
+		"from: ",
+		"subject",
+		"",
+	}
+
+	expected := map[string]string{
+		"to":      "me@example.com",
+		"from":    "",
+		"subject": "",
+	}
+
+	conf := Configuration{}
+	conf.Load(text)
+
+	assert.Equal(t, expected, conf.Data)
+}
+
+func TestConfiguration_Get(t *testing.T) {
+	conf := NewConfiguration()
+
+	conf.Set("foo", "bar")
+
+	assert.Equal(t, "bar", conf.Get("foo"))
+}
diff --git a/common/consts.go b/common/consts.go
new file mode 100644
index 0000000..822f413
--- /dev/null
+++ b/common/consts.go
@@ -0,0 +1,49 @@
+/* consts.go: global constants
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package common
+
+// Project wide constants.
+const (
+	TIME_FORMAT     = "15:04"
+	DATE_FORMAT     = "2006-01-02"
+	DATETIME_FORMAT = DATE_FORMAT + " " + TIME_FORMAT
+
+	DIR_TODO   = "todo"
+	DIR_DRAFTS = "drafts"
+	DIR_ERRORS = "errors"
+	DIR_DONE   = "done"
+
+	CMD_USAGE = "usage"
+	CMD_RUN   = "run"
+
+	CONF_WORKDIR         = "workdir"
+	CONF_DATE            = "date"
+	CONF_DAYS            = "days"
+	CONF_SUBJECT         = "subject"
+	CONF_TO              = "to"
+	CONF_FROM            = "from"
+	CONF_REPLY_TO        = "reply-to"
+	CONF_CC              = "cc"
+	CONF_BCC             = "bcc"
+	CONF_CONFIG_FILENAME = "config"
+	CONF_SMTP_SERVER     = "server"
+	CONF_SMTP_PORT       = "port"
+	CONF_SMTP_INSECURE   = "insecure"
+	CONF_NOT_BEFORE      = "not-before"
+	CONF_NOT_AFTER       = "not-after"
+)
diff --git a/common/message.go b/common/message.go
new file mode 100644
index 0000000..fbea53d
--- /dev/null
+++ b/common/message.go
@@ -0,0 +1,231 @@
+/* message.go: module for managing message information
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package common
+
+import (
+	"bufio"
+	"fmt"
+	"net/mail"
+	"os"
+	"path/filepath"
+)
+
+type Message struct {
+	Conf Configuration
+	Body []string
+	Name string
+}
+
+// Supporting sort.Interface.
+type Messages []Message
+
+// Load all messages in the given directory.
+func NewMessagesFromDirectory(dir string) Messages {
+	messages := []Message{}
+
+	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		// Only interested in regular files
+		if !info.Mode().IsRegular() {
+			return nil
+		}
+
+		// Parse only .msg files
+		if filepath.Ext(info.Name()) != ".msg" {
+			return nil
+		}
+
+		message, err := NewMessageFromFile(path)
+
+		if err != nil {
+			return err
+		}
+
+		messages = append(messages, message)
+
+		return nil
+	})
+
+	// TODO: Maybe return error?
+	if err != nil {
+		fmt.Printf("Error while reading messages from %s:\n\t%s\n", dir, err.Error())
+	}
+
+	return messages
+}
+
+func (m Messages) Len() int      { return len(m) }
+func (m Messages) Swap(i, j int) { m[i], m[j] = m[j], m[i] }
+func (m Messages) Less(i, j int) bool {
+	// TODO: We are being very confident here w.r.t. errors
+	t1, _ := ParseTime(m[i].Get(CONF_DATE))
+	t2, _ := ParseTime(m[j].Get(CONF_DATE))
+
+	return t1.Before(t2)
+}
+
+// Create a new, empty Message.
+func NewMessage() *Message {
+	return &Message{
+		Conf: *NewConfiguration(),
+		Body: []string{},
+		Name: "",
+	}
+}
+
+// Construct new Message from the given file.
+func NewMessageFromFile(path string) (Message, error) {
+	f, err := os.Open(path)
+
+	if err != nil {
+		return Message{}, err
+	}
+
+	defer f.Close()
+
+	scanner := bufio.NewScanner(f)
+
+	lines := []string{}
+
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+
+	msgConf, msgBody := SplitMessage(lines)
+
+	configuration := Configuration{}
+	configuration.Load(msgConf)
+
+	return Message{
+		Body: msgBody,
+		Conf: configuration,
+		Name: filepath.Base(path),
+	}, nil
+}
+
+// Write a message to a file, such that it could be loaded again.
+func (m *Message) WriteToFile(file string) error {
+	f, err := os.OpenFile(file, os.O_CREATE|os.O_WRONLY, 0666)
+
+	if err != nil {
+		return err
+	}
+
+	defer f.Close()
+
+	for _, s := range m.Conf.DumpConfig() {
+		f.WriteString(s)
+		f.WriteString("\n")
+	}
+
+	f.WriteString("\n")
+
+	for _, s := range m.Body {
+		f.WriteString(s)
+		f.WriteString("\n")
+	}
+
+	return nil
+}
+
+// Return the specified configuration key's value.
+func (m *Message) Get(key string) string {
+	return m.Conf.Data[key]
+}
+
+// Checks if set and if ParseAddressList succeeds
+func verifyAddressList(addresses string) error {
+	if addresses == "" {
+		// TODO: Why is this part different than the one in verifyAddress()? Maybe not intentional?
+		return nil
+	}
+
+	_, err := mail.ParseAddressList(addresses)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Checks if no nil and if ParseAddress succeeds.
+func verifyAddress(paramName string, address string) error {
+	if address == "" {
+		return fmt.Errorf("'%s' parameter is missing", paramName)
+	}
+
+	_, err := mail.ParseAddress(address)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Verify if a message has all necessary parameters. We need at least to, from,
+// subject, and date. This will also verify optional address lists, etc.
+func (m *Message) Verify() []error {
+	errors := []error{}
+
+	if err := verifyAddress("from", m.Get("from")); err != nil {
+		errors = append(errors, err)
+	}
+
+	if err := verifyAddress("to", m.Get("to")); err != nil {
+		errors = append(errors, err)
+	}
+
+	if m.Get("subject") == "" {
+		errors = append(errors, fmt.Errorf("'subject' parameter is missing"))
+	}
+
+	if m.Get("date") == "" {
+		errors = append(errors, fmt.Errorf("'date' parameter is missing"))
+	} else {
+		_, err := ParseTime(m.Get("date"))
+
+		if err != nil {
+			errors = append(errors, fmt.Errorf("'date' format error: %s", err.Error()))
+		}
+	}
+
+	if m.Get("reply-to") != "" {
+		if err := verifyAddress("nil", m.Get("to")); err != nil {
+			errors = append(errors, err)
+		}
+	}
+
+	if err := verifyAddressList(m.Get("cc")); err != nil {
+		errors = append(errors, err)
+	}
+
+	if err := verifyAddressList(m.Get("bcc")); err != nil {
+		errors = append(errors, err)
+	}
+
+	if len(errors) == 0 {
+		return nil
+	}
+
+	return errors
+}
diff --git a/common/message_test.go b/common/message_test.go
new file mode 100644
index 0000000..74ed09f
--- /dev/null
+++ b/common/message_test.go
@@ -0,0 +1,82 @@
+/* message_test.go: unit tests for the message module
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package common
+
+import (
+	"github.com/stretchr/testify/assert"
+	"path/filepath"
+	"sort"
+	"testing"
+)
+
+func TestReadMessagesAndVerify(t *testing.T) {
+	workdir := "testdata"
+
+	conf := NewConfiguration()
+	conf.Set("from", "me@example.com")
+
+	messages := NewMessagesFromDirectory(filepath.Join(workdir, "todo"))
+
+	for _, message := range messages {
+		// If we don't to this, it will fail because "from" is missing
+		message.Conf.MergeWith(conf)
+
+		if err := message.Verify(); err != nil {
+			t.Errorf("Verification of message '%s' failed with %s", message.Name, err)
+		}
+	}
+}
+
+func TestMessage_Get(t *testing.T) {
+	message := Message{Conf: *NewConfiguration()}
+
+	message.Conf.Set("foo", "bar")
+
+	assert.Equal(t, "bar", message.Get("foo"))
+}
+
+func TestMessagesSort(t *testing.T) {
+	messages := []Message{
+		{
+			Name: "1",
+			Conf: Configuration{
+				Data: map[string]string{
+					"date": "2000-01-01",
+				}}},
+		{
+			Name: "2",
+			Conf: Configuration{
+				Data: map[string]string{
+					"date": "2010-01-01",
+				}}},
+		{
+			Name: "3",
+			Conf: Configuration{
+				Data: map[string]string{
+					"date": "2005-01-01",
+				}}},
+	}
+
+	sort.Sort(Messages(messages))
+
+	for i, k := range []string{"1", "3", "2"} {
+		if messages[i].Name != k {
+			t.Errorf("expected: %s, but was %s", k, messages[i].Name)
+		}
+	}
+}
diff --git a/common/util.go b/common/util.go
new file mode 100644
index 0000000..a4422c7
--- /dev/null
+++ b/common/util.go
@@ -0,0 +1,63 @@
+/* util.go: various utility functions
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package common
+
+import (
+	"strings"
+	"time"
+)
+
+// Split a text in two parts on the first blank line.
+func SplitMessage(text []string) ([]string, []string) {
+	conf := []string{}
+	body := []string{}
+
+	inBody := false
+
+	for _, line := range text {
+		if !inBody && strings.TrimSpace(line) == "" {
+			inBody = true
+			continue // skip the separating line
+		}
+
+		if inBody {
+			body = append(body, line)
+		} else {
+			conf = append(conf, line)
+		}
+	}
+
+	return conf, body
+}
+
+// Parse a time which may either be just a date or a date with time.
+func ParseTime(datetime string) (time.Time, error) {
+	result, err := time.ParseInLocation(DATE_FORMAT, datetime, time.Now().Location())
+
+	if err == nil {
+		return result, nil
+	}
+
+	result, err = time.ParseInLocation(DATETIME_FORMAT, datetime, time.Now().Location())
+
+	if err == nil {
+		return result, nil
+	}
+
+	return result, err
+}
diff --git a/common/util_test.go b/common/util_test.go
new file mode 100644
index 0000000..201cfe0
--- /dev/null
+++ b/common/util_test.go
@@ -0,0 +1,79 @@
+/* util_test.go: unit tests for utility functions
+ *
+ * Copyright (C) 2016 Clemens Fries <github-clockrotz@xenoworld.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package common
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestSplitMessage(t *testing.T) {
+	message := []string{
+		"to: me@example.com",
+		"subject: foo",
+		"",
+		"Dear Me,",
+		"",
+		"have a nice day.",
+	}
+
+	conf, body := SplitMessage(message)
+
+	expectedConf := []string{
+		"to: me@example.com",
+		"subject: foo",
+	}
+
+	expectedBody := []string{
+		"Dear Me,",
+		"",
+		"have a nice day.",
+	}
+
+	assert.Equal(t, expectedConf, conf)
+	assert.Equal(t, expectedBody, body)
+}
+
+func TestParseTime(t *testing.T) {
+	d1 := "2061-07-28"
+	d2 := "2061-07-28 12:23"
+	invalid1 := "2061/07/28"
+	invalid2 := "2061-07-28 12:23:00"
+
+	r, err := ParseTime(d1)
+	assert.Nil(t, err)
+
+	if r.Hour() != 0 || r.Minute() != 0 {
+		t.Errorf("expected Hour and Minute to be 0, but was %s", r)
+	}
+
+	r, err = ParseTime(d2)
+	assert.Nil(t, err)
+
+	if r.Hour() != 12 || r.Minute() != 23 {
+		t.Errorf("expected Hour and Minute to be 12:23, but was %s", r)
+	}
+
+	// Expected to fail
+	_, err = ParseTime(invalid1)
+	assert.NotNil(t, err)
+
+	// Expected to fail
+	_, err = ParseTime(invalid2)
+	assert.NotNil(t, err)
+}
diff --git a/testdata/config.ini b/testdata/config.ini
new file mode 100644
index 0000000..d5195f4
--- /dev/null
+++ b/testdata/config.ini
@@ -0,0 +1,5 @@
+[default]
+from = me@example.com
+workdir = testdata
+server = mail.example.com
+port = 1234
diff --git a/testdata/todo/2061.msg b/testdata/todo/2061.msg
new file mode 100644
index 0000000..5378da5
--- /dev/null
+++ b/testdata/todo/2061.msg
@@ -0,0 +1,8 @@
+to: me@example.com
+subject: Watch Halley's Comet
+date: 2061-07-28
+
+Greetings!
+
+Go outside at night, if the curfew of the – highly welcomed — alien overlords
+permits, and watch Halley's Comet.
diff --git a/testdata/todo/2134.msg b/testdata/todo/2134.msg
new file mode 100644
index 0000000..3db6f3c
--- /dev/null
+++ b/testdata/todo/2134.msg
@@ -0,0 +1,11 @@
+to: cryogenics-department@example.com
+from: me-bot@example.com
+cc: me@example.com
+subject: Unfreeze Clemens
+date: 2134-01-01
+
+Dear Cryogenics Department,
+
+please unfreeze Clemens, as he wanted to watch this year's close pass of
+Halley's Comet. This one is going to have an apparent magnitude of -2.0 — it's
+gonna be fun, so feel free to join him!