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Re: [ietf-smtp] MX pointing to CNAME

2016-08-13 06:18:32
I'm on my iPhone at the moment so can't write in too much detail, but they're 
right according to my understanding.

See this page which has more info about it

Sent from my iPad

On 13 Aug 2016, at 11:49, Arnt Gulbrandsen 
<arnt(_at_)gulbrandsen(_dot_)priv(_dot_)no> wrote:


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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