[ietf-dkim] Discussion of Consensus check: Domain Existence Check
J D Falk
jdfalk at returnpath.net
Wed Jun 4 10:58:05 PDT 2008
On 04/06/2008 08:02, "John Levine" <johnl at iecc.com> wrote:
> 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.
On 04/06/2008 10:14, "Dave Crocker" <dhc at dcrocker.net> wrote:
> Unfortunately, it is rarely based on the rfc2822.From field. It is,
> instead, typically based on rfc2821.mailfrom.
> So we need to be careful about assuming that any of these tests are likely to
> be "free". In fact, one bit of feedback I got was explicit about these
> additional tests as costing too much. They had tried and found they added too
> much delay.
Too much delay for too little benefit, most likely. That balance seems
likely to change once more high-value domains sign with DKIM and use one of
the strict ADSP assertions.
Work with me!
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