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Re: [ietf-smtp] MTS-STS validation when MX host points to a CNAME, violating RFC 2181 § 10.3

2021-03-31 19:30:45
It appears that Mark Andrews  <marka(_at_)isc(_dot_)org> said:
You need properly read the quoted section that talks about MX target being a 
In particular this sentence from RFC 5321, 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.

In other words “It is your problem if the target of the MX refers to a CNAME
and things break."

The MX records for are NOT RFC compliant.  The target points to a CNAME.

Quite right.

"Doctor, doctor, it hurts when I do this."

"So don't do that."


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