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Re: SMART_HOST to port 465 or 587?

From Hugo Villeneuve-Lapointe <hugo_villap@email.invalid>
Newsgroups comp.mail.sendmail
Subject Re: SMART_HOST to port 465 or 587?
Date 2026-04-13 18:11 -0400
Organization A noiseless patient Spider
Message-ID <2960bm-08v2.ln1@EINTR.net> (permalink)
References <10rjcjs$23i1$1@gal.iecc.com> <10rjcuh$3h4e3$1@dont-email.me> <10rjg51$2kmm$1@gal.iecc.com> <10rjj1u$3j7e1$1@dont-email.me> <10rjmbc$lpm$1@gal.iecc.com>

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John Levine <johnl@taugh.com> wrote:
> It appears that Kalevi Kolttonen <kalevi@kolttonen.fi> said:
>>John Levine <johnl@taugh.com> wrote:
>>> Thanks, that should do it.  Just out of curiosity is
>>> there a way to tell it to do immediate TLS on port 465?
>>
>>I have no idea as I have never used port 465. I suppose
>>it is deprecated anyway, but I am not 100% sure.
> 
> It's not deprecated at all.  Every MTA I know supports it.  Even sendmail.

How does sendmail supports it?

I know there is Flag=s in DaemonPortOptions to open a port and offer
SMTP over SSL.

But I see nothing on how sendmail connects via SMTP over SSL to
other servers in op.ps or cf/README.

Sendmail can do an automatic fallback to pure TLS?


-- 
Hugo Villeneuve-Lapointe

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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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