On Fri, 1 Dec 2023, John Levine via Exim-users wrote:
It appears that Viktor Dukhovni via Exim-users <exim-us...@dukhovni.org> said:
That text is obsolete. There is no such text in RFC5321, and
CNAME-valued mail domains have long been OK. The sending MTA (its DNS
resolver) is expected to restart the MX lookup at the target of the
CNAME, and if no MX records are found, use the final A/AAAA records.
Huh, you're right. In my minor defense, the CNAME code was written in
1998, RFC 2821 was published in 2001, and as far as I can tell this is
the first time in 20 years that I've sent to a CNAME'd domain that
caused a problem. I'll go patch the code.
Just wondering, I'm pretty sure I sent mail to this list in the past.
Is the CNAME new?
I have mail from you to this list in 2021 and the exim-dev list in 2022.
The headers suggest that exim.org was served by hummus.csx.cam.ac.uk
at that time, so may well not have used a CNAME.
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.uk
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