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[ietf-smtp] MX pointing to CNAME

2016-08-13 05:50:10

I’ve just run across a biggish sender that insists that MX records point to 
A/AAAA records and therefore cannot send mail to a site whose MX points to a 
CNAME (which in turn points to an A).

The sending site’s FAQ says this is due to applicable FAQs, without citing 
chapter and verse. Ahem. I found a question on serverfault which claims 1123 
forbids pointing to CNAME in MX, but don’t see any applicable text in 1123. I 
do see something in 974... but I’d like to hear your opinion on the issue.


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