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Re: SMART_HOST to port 465 or 587?

From Bjørn Mork <bjorn@mork.no>
Newsgroups comp.mail.sendmail
Subject Re: SMART_HOST to port 465 or 587?
Date 2026-04-14 08:26 +0200
Organization m
Message-ID <87qzoit5vb.fsf@miraculix.mork.no> (permalink)
References (1 earlier) <10rjj1u$3j7e1$1@dont-email.me> <10rjmbc$lpm$1@gal.iecc.com> <2960bm-08v2.ln1@EINTR.net> <10rk0ua$2o7t$1@gal.iecc.com> <lpo0bm-8oj.ln1@EINTR.net>

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Hugo Villeneuve-Lapointe <hugo_villap@email.invalid> writes:
> John Levine <johnl@taugh.com> wrote:
>
>> That's it.  Ports 465 and 587 are for submission, from an MUA to an MSA.
>> 
>> In my application the old server is the submission cient and the new server
>> is the submission server.
>
> I'm afraid I don't think it is possible to do SMTP over SSL (port
> 465) between 2 sendmail servers (or I don't know how to do that).

Well, there is the _FFR_SMTPS_CLIENT build time feature, enabling
underscore as a F= delivery agent flag:

#if _FFR_SMTPS_CLIENT
# define M_SMTPS_CLIENT '_'     /* use SMTP over TLS (465/TCP) */
#endif

But you'll probably have to build your own sendmail binary for that.

I'd just go with STARTTLS if it was me...


Bjørn

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Thread

SMART_HOST to port 465 or 587? John Levine <johnl@taugh.com> - 2026-04-13 18:28 +0000
  Re: SMART_HOST to port 465 or 587? kalevi@kolttonen.fi (Kalevi Kolttonen) - 2026-04-13 18:33 +0000
    Re: SMART_HOST to port 465 or 587? John Levine <johnl@taugh.com> - 2026-04-13 19:28 +0000
      Re: SMART_HOST to port 465 or 587? kalevi@kolttonen.fi (Kalevi Kolttonen) - 2026-04-13 20:18 +0000
        Re: SMART_HOST to port 465 or 587? John Levine <johnl@taugh.com> - 2026-04-13 21:14 +0000
          Re: SMART_HOST to port 465 or 587? kalevi@kolttonen.fi (Kalevi Kolttonen) - 2026-04-13 21:39 +0000
          Re: SMART_HOST to port 465 or 587? Hugo Villeneuve-Lapointe <hugo_villap@email.invalid> - 2026-04-13 18:11 -0400
            Re: SMART_HOST to port 465 or 587? John Levine <johnl@taugh.com> - 2026-04-14 00:15 +0000
              Re: SMART_HOST to port 465 or 587? Hugo Villeneuve-Lapointe <hugo_villap@email.invalid> - 2026-04-13 23:27 -0400
                Re: SMART_HOST to port 465 or 587? Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-14 02:20 -0400
                Re: SMART_HOST to port 465 or 587? Hugo Villeneuve-Lapointe <hugo_villap@email.invalid> - 2026-04-14 22:24 -0400
                Re: SMART_HOST to port 465 or 587? Bjørn Mork <bjorn@mork.no> - 2026-04-14 08:26 +0200
                Re: SMART_HOST to port 465 or 587? John Levine <johnl@taugh.com> - 2026-04-14 18:27 +0000
  Re: SMART_HOST to port 465 or 587? Andrzej Adam Filip <anfi@onet.eu> - 2026-04-13 21:00 +0200

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