On Fri, 1 Dec 2023, John Levine via Exim-users wrote:
> It appears that Viktor Dukhovni via Exim-users <exim-users@???> 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 That text is obsolete.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
andrew@???
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