Thanks, Iain, you got an answer for everything!
The msmtp-queue seems to be the perfect solution. I will try this out and report back.
Best, Robert

On Wed, 5 Aug 2020 at 09:33, Iain Parris <ipv2.lst@parris.org> wrote:
Hi Robert,

Excerpts from Robert Winkler's message of 2020-08-04 13:22:23 -0700:
> Hi, an efficient strategy to reduce email traffic is the delayed sending of
> emails.
> This also would allow the offline writing of emails.
> Is there a way to do this in sup?

Sup passes each email message to an external program to send
(config.yaml, option "sendmail").

For example, I personally use msmtp.

To queue/delay messages, the solution would be to call an external
program with this functionality built in.

For example, I haven't used this personally, but perhaps something like
msmtp-queue-scheduler may be of interest?
<https://github.com/parisni/msmtp-queue-scheduler>

(The README references Mutt, however, this should work with any MUA,
i.e., should work with Sup.)

Side note: I have received your email from 24 July re: keybindings,
however, haven't yet looked in the detail required. I'll try to look
within approximately the next week if I can, unless someone else on the
mailing list beats me to it. :-)

Kind regards,
Iain

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