Hi,
I'd like to throw in my thoughts on the subject.
No disrespect to Zimbra but I don't see its forte being anti-spam. Its an extra
service that could work for some people - as per user filtering isn't its focus
eventually I've found a tug-of-war scenario where emails are marked spam then
ham as some emails are spam to one user and ham to another. That said, I've
been running a few instances of Zimbra for many years now and very happy with
everything it offers (collaboration being one of its many strengths). I'd
recommend you setup a mail gateway that does all the anti-spam/anti-virus work
for you.
I have a postfix/dspam/clamav/mailscanner/baruwa setup that does per user
anti-spam filtering and I've see fantastic results (in excess of 95% accuracy
for some users).
Since Zimbra has the functionality of acting on the "hook" of the "Junk" folder
anything a user adds or removes from the folder can be redirected to dspam and
trained there using the dspam signature. I do this in Zimbra by using:
zmprov mcf zimbraSpamHeader X-DSPAM-Result
zmprov mcf zimbraSpamHeaderValue Spam
zmprov mcf zimbraSpamIsSpamAccount spam-train...@example.com
zmprov mcf zimbraSpamIsNotSpamAccount notspam-train...@example.com
You can then setup a forwarder for the {notspam,spam}-train...@example.com
addresses and point it to your dspam mail gateway.
/etc/aliases on my mail gateway then pipes those addresses to a script that
finds the original signature and associated address (MySQLUIDInSignature does
this for you apparently but I only discovered this after the system was live)
and then summons dspam to train the filter using the original email address it
was sent to.
For incoming email I have dspam doing externallookups using zimbra's ldap -
great for making sure you keep all training per account + all it's aliases.
Over and out,
--
Garith Dugmore
Senior System Administrator
South African Astronomical Observatory
and Southern African Large Telescope
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