[ietf-dkim] Discussion of Consensus check: Domain Existence Check

[J D Falk]

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
> cost.
> 
> This gives senders a baseline that they know receivers will do, and if
> the receivers are more sceptical, that doesn't hurt the senders.

+1


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.

-- 
J.D. Falk
Return Path

Work with me!
http://www.returnpath.net/careers/

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