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From: Len Conrad (lconradGo2France.com)
Date: Fri Oct 01 2010 - 12:27:35 CDT
=>I actually use postgrey as greylisting utility
>I have no experience with other greylisting softwares
>but Postfix "gurus" advice would be greatly appreciated
>to compare and eventually change for another software.
postgrey and its fork sqlgrey are pretty much optimum. I think changing to something else won't buy you much if any improvement.
I have one high volume site, 200K+ msgs/day accepted per MX, with SQLgrey on 3 MXs where the:
(new but retried) / (total new)
is less that 2%.