Massive queue buildup

Randal, Phil prandal at
Tue Nov 14 10:35:02 GMT 2006

"One important thing to watch for is that for larger sites the server
first tries to send your email might not be the one that tries to resend
it later. Greylisting sites will thus block the email for a while until
the sending site gets lucky and uses the same machine twice in a row.

Generating tempfail messages to sending sites is just asking for
trouble IMHO. You really can't determine exactly they will act and how
long they will take to retry to send the message. Any delay is 100%
your fault although most people using greylisting seem keen to push the
blame to the sending site.

It's the equivalent of ignoring someone when they first email/call you
saying "If it's important they'll ring back" . Not very polite and
possibly not providing the best service to customers."
That's precisely why milter-greylist has a whitelist of non-conformant
hosts / subnets.
Phil Randal
Network Engineer
Herefordshire Council
Hereford, UK  
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