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comp / comp.mail.sendmail / Submit by running sendmail submits to 127.0.0.1 ?

SubjectAuthor
* Submit by running sendmail submits to 127.0.0.1 ?John Levine
`- Re: Submit by running sendmail submits to 127.0.0.1 ?Marco Moock

1
Subject: Submit by running sendmail submits to 127.0.0.1 ?
From: John Levine
Newsgroups: comp.mail.sendmail
Organization: Taughannock Networks
Date: Sun, 10 Mar 2024 02:49 UTC
Path: eternal-september.org!news.eternal-september.org!feeder3.eternal-september.org!weretis.net!feeder6.news.weretis.net!news.misty.com!news.iecc.com!.POSTED.news.iecc.com!not-for-mail
From: johnl@taugh.com (John Levine)
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)
View all headers

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

Subject: Re: Submit by running sendmail submits to 127.0.0.1 ?
From: Marco Moock
Newsgroups: comp.mail.sendmail
Organization: A noiseless patient Spider
Date: Sun, 10 Mar 2024 07:48 UTC
References: 1
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: mm+usenet-es@dorfdsl.de (Marco Moock)
Newsgroups: comp.mail.sendmail
Subject: Re: Submit by running sendmail submits to 127.0.0.1 ?
Date: Sun, 10 Mar 2024 08:48:54 +0100
Organization: A noiseless patient Spider
Lines: 33
Message-ID: <usjol6$2rpj3$1@dont-email.me>
References: <usj746$1ec3$1@gal.iecc.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Injection-Date: Sun, 10 Mar 2024 07:48:54 -0000 (UTC)
Injection-Info: dont-email.me; posting-host="d51114f154be1bb5a6f9db15ee5d2533";
logging-data="3008099"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19dSFIPqLvqxWxV/mPpz15D"
Cancel-Lock: sha1:SGvEpzzjufb4iUbEaYEwm1qpngI=
View all headers

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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