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I run a mail server with OpenBSD's spamd[1] with greylisting and it works well enough. Most spam is not sent by SMTP compliant hosts. Blacklisting makes it particularly hard to recover IPs that have ever been compromised and unfairly hurts good hosts on otherwise untrustworthy (like some home ISPs) networks.

[1] http://www.openbsd.org/spamd/




Greylisting is what makes the biggest difference for us too.




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