Spam-Fighting Tips
When used selectively, blacklists combined with spamd are powerful, precise, and efficient spam-fighting tools. The load on the spamd machine is minimal. On the other hand, spamd will never perform better than its weakest data source, which means you will need to monitor your logs and use whitelisting when necessary.
It is also feasible to run spamd in a pure greylisting mode, with no blacklists. In fact, some users report that a purely greylisting spamd configuration is about as effective a spam-fighting tool as configurations with blacklists, and sometimes significantly more effective than content filtering. One such report that was posted to openbsd-misc (accessible among other places via http://marc.info/; search for the ...
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