Path: csiph.com!eternal-september.org!feeder.eternal-september.org!nntp.eternal-september.org!.POSTED!not-for-mail
From: =?utf-8?Q?Bj=C3=B8rn_Mork?= <bjorn@mork.no>
Newsgroups: comp.mail.sendmail
Subject: Re: SMART_HOST to port 465 or 587?
Date: Tue, 14 Apr 2026 08:26:16 +0200
Organization: m
Lines: 24
Message-ID: <87qzoit5vb.fsf@miraculix.mork.no>
References: <10rjcjs$23i1$1@gal.iecc.com> <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>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Injection-Date: Tue, 14 Apr 2026 06:26:17 +0000 (UTC)
Injection-Info: dont-email.me; posting-host="4da6a0399d5efc273cebcb61a25038b5"; logging-data="4109525"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX18ADFQLKDtV1p3WBn0x+MN2"
User-Agent: Gnus/5.13 (Gnus v5.13)
Cancel-Lock: sha1:CmDexqi+pStZ7t18cpKBhc+p9V0= sha1:NR1PrM3h2BaqJnoQvYzNOJyYUE8=
Xref: csiph.com comp.mail.sendmail:8298

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