If you want to use greylisting I recommend SQLgrey. This Postfix policy server works with SQLite, MySQL and PostgreSQL. It auto-whitelists but also keeps the whitelist lean. I.e. whitelist entries that haven't come back in x time (1 month for example) will be removed again. And you have OPTIN/OPTOUT support per domain/email accounts. Handy for ISP's and such.
See http://sqlgrey.sourceforge.net/ for more info.

Hope this helps.

Regards,
Robert

On 27-sep-2007, at 12:55, Kerem Hadimli wrote:

Hi,
here i would suggest using Greylisting policy for all incoming mail.

Here's the explanation of how it works:
http://projects.puremagic.com/greylisting/

And here's Postgrey, Greylisting policy server for Postfix:
http://postgrey.schweikert.ch/

It really prevents most of the (I mean more than 95% maybe) spam.
Currently I don't have any anti-spam solution on my servers except
postgrey.

regards,
Kerem HADIMLI

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