Building the Network You Need with OpenBSD's PF: BSDCan, Ottawa May 6th, 2009
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# Giving spammers a hard time: Conclusion

Summing up:

- High precision

- Good effect, minimal load

- Blacklisting is never better than poorest data source used

  We ended up using Bob Beck's traplist (greytrapping generated) at http://www.openbsd.org/spamd/traplist.gz - as far as we know no false positives. (graph)

- Prime example: Steve Williams' October 20th, 2006 message to the OpenBSD-misc mailing list - got rid of more than 95% of spam using spamd in pure greylisting mode

- Greytrapping is fun and effective: See bsdly.blogspot.com