A while ago I wrote mu4e-delay, a package (based heavily on gnus-delay), to add a customisable delay to outgoing mail so that a sent email could be “undone” before the delay period had passed. This was spectacularly useful for me, but now Benny Andresen has put together the superior mu4e-send-delay, which improves on my package in several ways.

The key features of mu4e-send-delay are (from the github page):

• mu4e context support
• Saves scheduled mails to mu4e-drafts-folder
• Uses an emacs timer to check Drafts if a mail is scheduled to be sent now
• Allows easy edit of the X-Delay header in mu4e-compose-mode
• Displays scheduled time in mu4e-view
• Doesn’t send if mail is currently being edited
• Works with attachments

The last four points are all improvements over the original mu4e-delay, with the last two being the most important. I’d encourage any mu4e-delay users to switch over to mu4e-send-delay. I have, and I’ve not looked back!