Re: Submit by running sendmail submits to 127.0.0.1 ?

On 10.03.2024 um 02:49 Uhr John Levine wrote:

It looks like sendmail submitted the message by ESMTP to 127.0.0.1.

The MSP (mail submission program, calling sendmail directly to send the
mail) sends it to 127.0.0.1:25 by default. See submit.mc.

So to check that, I telnet'ed to 127.0.0.1 and sending it directly:
 Mar  9 21:25:12 xxx sendmail[63488]: 42A2OcIV063488:
from=<jrl396@xxx>, size=58, class=0, nrcpts=1,
msgid=<202403100224.42A2OcIV063488@xxx>, proto=ESMTP, daemon=MTA,
relay=localhost [127.0.0.1] Mar  9 21:25:12 xxx sendmail[64171]:
STARTTLS=client, relay=mail.xxx., version=TLSv1/SSLv3, verify=FAIL,
cipher=ECDHE-RSA-AES256-GCM-SHA384, bits=256/256
 Yup, that worked fine.
 Submitting to 127.0.0.1 rather than running sendmail will always be
faster since it's doing less work, right?

By default, yes.
At least in Debian, it uses different queues for the MSP and the MTA
and the mail will be saved to both in that situation. See SuperSafe
config option.
If you have slow disks, this can take seconds to finish and go out.
--
kind regards
Marco
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