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Re: [ietf-smtp] MX pointing to CNAME

2016-08-24 06:18:24
Arnt Gulbrandsen <arnt(_at_)gulbrandsen(_dot_)priv(_dot_)no> wrote:

but I’d like to hear your opinion on the issue.

MX -> CNAME is not allowed according to the RFCs but sensible
implementations support it in the obvious way. There was a massive
flamewar on this topic during the work on RFC 5321 leading to some
awkward verbiage in section 5.1:

   Any other response, specifically including a value that will return a
   CNAME record when queried, lies outside the scope of this Standard.

f.anthony.n.finch  <dot(_at_)dotat(_dot_)at>  -  I xn--zr8h 
Southeast Biscay: Variable 3 or 4. Slight or moderate. Mainly fair. Good.
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