Re: git send-email says AUTH is unknown command?

From: Jeff King <peff@peff.net>
Date: May 6, 2021, 17:06 UTC
Message-ID: <YJQiFYYENfsZk7B+@coredump.intra.peff.net>
In-Reply-To: <87k0obvqa1.fsf@evledraar.gmail.com>

On Thu, May 06, 2021 at 05:22:31PM +0200, Ævar Arnfjörð Bjarmason wrote:

Show 19 quoted lines

> 
> On Thu, May 06 2021, Phillip Susi wrote:
> 
> > git send-email prompts for my SMTP password then says:
> > Command unknown: 'AUTH' at /usr/lib/git-core/git-send-email line 1573.
> >
> > That line reads:
> >
> > smtp_auth_maybe or die $smtp->message;
> >
> > Why is it complaining that it does not know what AUTH means?  It is
> > connecting to port 25 and /should/ be using STARTTLS.
> 
> This message is from your server indirectly, i.e. there is no AUTH verb
> supported by it.
> 
> I'm almost certain that you'll find that you cannot in fact auth on port
> 25 on this server, and must use another port to do SSL from the start,
> i.e. not STARTSSL[1].

Alternatively, it may be that the server would prefer port 587 (with STARTTLS), which is typically used for "submission" (i.e., originating new messages from authenticated users, versus the normal port 25 for MTA's routing messages between them).

-Peff