On Mar 18, 2009, at 11:50 AM, Franck Martin wrote:
As a side benefit of DKIM all emails, it should be possible to
filter NDRs by looking in the attached email (which generated the
NDR) if there is a valid dkim header.
I know some MTA do not include the email, nor the full email but a
lot do.
This would help weeding out NDRs which have been created due to fake
emails
Is that make sense?
Yes. There are other (better) ways to do the same sort of thing, if
you're making the assumption that all mail is sent through a smarthost
you control (BATV), but this is another data point you could use.
You're unlikely to be able to verify whether the bounced mail is DKIM
signed in many cases, but you can use the DKIM-Signature header in the
same way you might use an X-Loop or similar header as a sign that it
was mail you may have sent.
Cheers,
Steve
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