"jdow" (on Mon, 12 Jun 2006 16:03:46 -0700) wrote:
>Greylist those who have not subscribed. Let their email server try
>again in 30 minutes. For those who are not subscribed it should not
>matter if their message is delayed 30 minutes. And so far spammers
>never try again.
Not true. I greylist and my recent logs show a pattern of spam code
that tries 5 times at exactly 5 minute intervals, before finally giving
up. Other spam code tries two or three times at one hour intervals.
All designed by spammers to bypass greylist systems.
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