-----Original Message-----
From: asrg-bounces(_at_)irtf(_dot_)org
[mailto:asrg-bounces(_at_)irtf(_dot_)org] On Behalf Of Peter J. Holzer
Sent: Wednesday, October 19, 2011 8:59 AM
To: asrg(_at_)irtf(_dot_)org
Subject: Re: [Asrg] Greylisting BCP
* Some sender MTAs change the envelope sender with every delivery
attempt (Yahoo Groups used to do this, but stopped several years ago.
I don't know any recent example). This garantuees that the triple
never matches ...
Yuck. OK, added.
* Some ISPs use one machine for the first delivery and another for
processing the queue. The "queue processing" IP will get whitelisted
but the "first try" address wont (unless you are lucky), resulting in
a constant delay for every mail.
I think that's covered, in slightly more general terms.
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