Thomas Schneider <qsx@chaotikum.eu> writes:

> Hello list,
>
> I use notmuch with the Emacs frontend and multiple accounts.  I’d like
> it to set the domain part of Message-Id header of any mail I compose to
> something sensible, e.g. the FQDN of the host (which does not seem to be
> easy, see [0]) or the domain part of the From header.

There is some discussion on the wiki of using gnus-alias and
message-templ with notmuch. The latter is more about setting headers.

>
> I was thinking about setting message-user-fqdn based on the From header
> in an appropriate hook, but I haven’t found yet where and how to do
> this.

There is notmuch-mua-send-hook (which by default just runs message-send-hook)

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