Matthias Leisi wrote:
* If circumstances permit, make use of extensive whitelisting, so that
you can increase the score of rules (or maybe lower the threshold after
which you consider a message to be spam).
With all due respect, that's risky... My users often get legit mails out
of blue or e-mail new parties and I could react to that only after the
fact.
* Experiment with additional blacklists (but beware of false positives).
* Consider using some blacklist(s) to actually reject messages before
they reach SpamAssassin (often, the Spamhaus lists are fine for that
purpose).
I already do that (among other reasons, it is far cheaper than SA
scanning), just today:
Rejections by:
RBLs 2856
SA permanent rejection 871
Sender Verify failed 4627
As you can see, sender verify (a feature in Exim) is very effective at
cutting out lots of spam, so there's little left for SA to work on.
Granted, it's controversial, but extremely effective.
Regards,
Marcin Krol
