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Path: ...!news.mixmin.net!weretis.net!feeder6.news.weretis.net!news.misty.com!news.iecc.com!.POSTED.news.iecc.com!not-for-mail
From: John Levine <johnl@taugh.com>
Newsgroups: comp.mail.sendmail
Subject: Submit by running sendmail submits to 127.0.0.1 ?
Date: Sun, 10 Mar 2024 02:49:42 -0000 (UTC)
Organization: Taughannock Networks
Message-ID: <usj746$1ec3$1@gal.iecc.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Injection-Date: Sun, 10 Mar 2024 02:49:42 -0000 (UTC)
Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970";
	logging-data="47491"; mail-complaints-to="abuse@iecc.com"
Cleverness: some
X-Newsreader: trn 4.0-test77 (Sep 1, 2010)
Originator: johnl@iecc.com (John Levine)
Bytes: 2384
Lines: 25

I was looking at the logs and saw this when I sent myself a test
message by running sendmail and typing the message:

Mar  9 21:21:36 xxx sendmail[58329]: 42A2LKNa058329: from=jrl396, size=57, class=0, nrcpts=1, msgid=<202403100221.42A2LKNa058329@xxx>, relay=jrl396@localhost
Mar  9 21:21:36 xxx sendmail[58608]: 42A2Lah7058608: from=<jrl396@xxx>, size=386, class=0, nrcpts=1, msgid=<202403100221.42A2LKNa058329@xxx>, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1]
Mar  9 21:21:36 xxx sendmail[58329]: 42A2LKNa058329: to=johnl@iecc.com, ctladdr=jrl396 (14132/14132), delay=00:00:16, xdelay=00:00:00, mailer=relay, pri=30057, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (42A2Lah7058608 Message accepted for delivery)

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

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?




-- 
Regards,
John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly