On 2018-04-11 at 14:41 -0700, Carl Byington wrote:
> So we could (do what they want) interpret mx:mail.example.com as if it
> were a:mail.example.com

FWIW, both RFC 4408 from 2006 and RFC 7208 from 2014 explicitly
"MUST NOT" this behavior.

Section 5.4 in each.

> What does your code do when it sees mx:mail.example.com, where there is
> no mx record, but there is an a record?

Exim uses libspf2 and does whatever libspf2 does.  Actually looking in
libspf2's codebase, it looks like it complies with the RFCs here.

-Phil, Exim hat probably on

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