Dan Horne wrote:

Spamc operates pretty much the same as spamassassin, except that instead of loading the beast that is perl itself and all the SA libs, it will just pipe the message over to the spamd daemon that already has perl and SA libs loaded. In most cases, simply switching your command from /usr/bin/spamassassin to /usr/bin/spamc and making sure that spamd is started automatically is all you need to do for a major performance increase. If you're calling Amavisd earlier, users are still having their mail filtered... I'm not a big fan of Amavisd with Courier, I have clamcour (http://sourceforge.net/projects/clamcour/) setup as a courierfilter for virus blocking, previously I used clamassassin (http://drivel.com/clamassassin/) from maildrop but since ClamAV has never returned a false positive for me yet, I decided to have it block viruses outright instead of silently discarding them later. I do not make the AV filter an option to users. Then I call SpamAssassin for all users. If users want to "turn off" spam filtering, they can set their sa_score to 100 which prevents messages from being flagged. But you could also use the mysql code I showed you before if you want to prevent SA from running at all on those who opt-out of spam filtering.