[ietf-dkim] Discussion of Consensus check: Domain Existence Check
lear at cisco.com
Wed Jun 4 08:39:17 PDT 2008
John Levine wrote:
>>>> * levine-adsp-00 provides a superset of methods for *how* to
>>>> determine if the domain exists: the NXDOMAIN test and the "check MX&
>>>> A/AAAA" method from SMTP. It leaves it up to the implementation to
>>>> choose the algorithm that works best for it.
> What I should have said was that recipients MUST do the NXDOMAIN check
> and SHOULD do the more comprehensive 2821 check. It's SHOULD since it
> is my impression that many MTAs do it anyway, so there's no incremental
> This gives senders a baseline that they know receivers will do, and if
> the receivers are more sceptical, that doesn't hurt the senders.
That would be fine.
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