bug#63311: 30.0.50; [PATCH] smtpmail-send-it split

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: 63311@debbugs.gnu.org
> Date: Sun, 05 Nov 2023 17:12:03 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Nothing, AFAIU.  Instead of making smtpmail-send-it optionally working
> > asynchronously, it should be perfectly valid to have a separate
> > function called, say, message-send-asynchronously, which would work
> > with background threads and implement the same protocol as the other
> > MUA's send-it functions do.
> 
> Ok.  But there is still the case where any 'error' call from a thread
> will end up in limbo, no?

The caller will need to fetch it and display it.