[imp] SAM / spamassassin for filtering

[Liam Hoekenga]

I've been trying to play around with the SAM module.  I can configure it using
SAM, and I can blacklist and whitelist addressess... but I'm having a hard time
seeing where spamassassin is actually getting invoked.

I mean, I found SAM stanza in horde/conf/registry.php, and I uncommented the
"provides" line...

    // Uncomment this line if you want Sam to handle the blacklist
    // filter instead of IMP:   

    'provides' => array('mail/blacklistFrom', 'mail/showBlacklist', 
        'mail/whitelistFrom', 'mail/showWhitelist'),

But as far as I can tell, spamassassin never gets called.  Should it get invoked
when the filters are applied?  Does spamd need to be running?  Can it actually
filter spam as well as do the blacklist / whitelist stuff?

Liam