send-delayed-mail

send-delayed-mail checks your postponed/drafts Maildir folder for any that have been marked with the special header X-Delay, it sends those that match the regular expression supplied as its argument.

It is meant to be used in conjunction with cron to schedule dispatch times.

This program is intended for use with Maildir-backed mail clients like mutt that make it easy to modify and add mail headers while composing mail.

Example

For example, if you created a draft with the following structure:

From: My Name <my@email.com>
To: recipient@there.com
Cc: 
Bcc: 
Subject: This should be sent in the morning
Reply-To: 
X-Delay: morning

Hello!

And you run the command:

send-delayed-mail morning

then it will send this mail, and move the draft to a different folder.

Installation

To configure and build, run:

make 

To install send-delayed-mail in ~/bin, run:

make install

Setting up dispatch times

Use crontab -e to edit your cron jobs, and then add entries like the following:

30 5  * * * ~/bin/send-delayed-mail > ~/tmp/delay.log morning  2>&1
0  12 * * * ~/bin/send-delayed-mail > ~/tmp/delay.log noon     2>&1
0  13 * * * ~/bin/send-delayed-mail > ~/tmp/delay.log 1pm      2>&1
59 23 * * * ~/bin/send-delayed-mail > ~/tmp/delay.log midnight 2>&1

Then, you can use X-Delay headers like morning, noon, 1pm and midnight.

Troubleshooting

Be sure to specify the full path to your sendmail clone.

I set this up to work with msmtp.