Ralf,

> I tried D_DISCARD an $spam_quarantine...=emailaddress and now
> the user is free from spam and spambob has his mailbox filled.

This achieves the effect you want, but is not the right tool for the job.
It shows its defect on multi-recipient messages, a single quarantine
message contains the envelope information for all recipients, which
violates sender's privacy (although, since you get mail via fetchmail,
this is probably a non-issue in your particular case).

The right tool to redirect spam into dedicated user's folder
is to let amavisd append address extension for spam, and tell
MTA or the delivery agent to reroute such mail to a special location.
See http://www.ijs.si/software/amavisd/amavisd-new-docs.html#addrext

> the recognition rate is pretty poor - I probably have not found the
> right screws to tighten.

See Gary's mail. Use network tests, bayes, razor, dcc, sa-update,
common SARE rules. With later versions of amavisd-new you can add
p0f and pen-pals whitelisting to the mix. User-contributed plugins
ImageInfo and FuzzyOcr are a recent and interesting addition
(the former is quick/cheap and quite effective, the later is
complex and can be slow, but is an interesting and currently quite
efficient tool).

  Mark

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