Kenneth Porter via Postfix-users:
> --On Tuesday, December 10, 2024 1:02 AM +0300 Michael Tokarev via
> Postfix-users <postfix-users@postfix.org> wrote:
>
> > And the good news is that this is actually not difficult, -
> > I'm really curious which probs people are having with that,
> > a distribution-provided postfix.service should run just fine.
> > It depends on network and nss-lookup, and that's basically it.
> > Maybe there are some other missing deps, - I'd love to know
> > about this and add them accordingly.
>
> I have a systemd unit on another distro that submits mail with /bin/mail
> (part of mailx) at boot and shutdown. What dependencies are needed to make
> that work here? (This notifies me when a remote system comes up that it was
> gracefully shut down and is now up again, and when that happened.) Based on
> this:
>
> <https://askubuntu.com/questions/851946/send-me-an-email-on-computer-shutdown>
Postfix does not need to be running, to receive a message from
/bin/mail. The message will just sit in the maildrop queue until
after Postfix is started.
And if the system does down while Postfix was already working on
the message, then that is OK too. All message delivery state is
persisted to the file system. If Postfix is stopped mid-delivery,
it will repeat the failed step later.
Wietse
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