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  • Submit by running sendmail submits to 127.0.0.1 ?

    From John Levine@21:1/5 to All on Sun Mar 10 02:49:42 2024
    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

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  • From Marco Moock@21:1/5 to All on Sun Mar 10 08:48:54 2024
    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

    Send spam to 1710035382muell@cartoonies.org

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