> On Jan 14, 2019, at 10:29 PM, John Levine <[email protected]> wrote:
>
> When the ABNF about extended-domain was written with the comment about
> info derived from the TCP connection, the TCP connection was
> synonymous with the transport. Now the transport is TCP plus STARTTLS
> in various versions plus SNI, none of which was contemplated back in
> 2001. I think it's reasonable to use extended-domain for info about
> the underlying transport, even if the details are not strictly about
> TCP. After all, the rDNS name in the FROM extended-domain comes from
> a DNS PTR lookup of the IP address which uses IP over UDP so it's
> never been strictly about TCP.
To make sure that we're talking about the same thing, I want to check
that you're proposing:
Received: from client.example.com (client.example.com [192.0.2.1])
by mta.example.net (split-personality-sni.example.net [192.0.2.2])
...
where the "TCP-Info" in the "BY" clause records the SNI name? Is that
right? It is an interesting idea, but perhaps that boat had sailed
many decades ago? Starting with Sendmail versions going back to at
least the mid 1980's, the "comment" after the "BY" clause has been
used primarily used to record the MTA software version, though usages
do very. Here are some trace headers from a single message:
Received: from zardoc.esmtp.org (zardoc.esmtp.org [75.101.48.117])
(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by mournblade.imrryr.org (Postfix) with ESMTPS id AB5307A3309
for <[email protected]>; Fri, 22 Jun 2018 16:30:20 +0000 (UTC)
(envelope-from [email protected])
Received: from x2.esmtp.org (localhost. [127.0.0.1])
by zardoc.esmtp.org (MeTA1-1.1.Alpha10.0) with ESMTPS
(TLS=TLSv1.2, cipher=ECDHE-RSA-AES256-GCM-SHA384, bits=256, verify=OK)
id S000000000033346B00; Fri, 22 Jun 2018 09:30:18 -0700
Received: (from ...@localhost)
by x2.esmtp.org (8.14.6/8.12.10.Beta0/Submit) id w5MGUIOU003106
for [email protected]; Fri, 22 Jun 2018 09:30:18 -0700 (PDT)
None of the "BY" clauses look like "TCP-Info". Looking at Exim messages in
my mailbox, it puts no comments after "BY". Only your messages from Qmail
seem to have transport related information int the comment following the
"BY" clause...
--
Viktor.
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