enable spamassassin?

[rbtux]

In my experience this spam folders are not the best solution either. A lot of mails lay in there for a week or two because the customer forgot to look ;-)

With autolearning I would be very very very very careful. We did this once with a spam folder where users could move mails to be learned as spam to. Problem is the user also thinks the newsletter he subscribed to and he doesnot remember is spam...
This will messup your bayes filter....

bayes are self-trained and that leads to much more accurate results in my experience. But this of course depends on the customers and the type of spam you have to deal with in general...

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about the tagging thing:

as you may have seen:
$sa_tag2_level_deflt = 5.8;
$sa_kill_level_deflt = 6.41;

with tag2_level you define the score needed to be tagged as spam, kill_level defines the score when mails are rejected. In our company we use 6.0 und 6.9. 6.9 is very conservative and I don't think we actually have false-positives with this settings... 90% of mails are rejected before they reach spamassassin anyway...