Hi Meaulnes,
It would be a good idea to add the IP of the sending hosts that you've
got problems with to that list.
It appears that host is not re-queuing emails within a reasonable time
if the delivery had been refused with a tempfail.
We have had to stop using greylisting unfortunately because a lot of the big
players (Microsoft, Google etc.) are using pools of servers and when mail
retries it comes from a different server in the pool (and different IP as a
result) each time and sometimes it can take several hours before mail finally
gets accepted. It is a shame because greylisting does cut down a lot on the
spam, but customers started complaining!
Regards
Colin
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