[Spambayes] spambayes ineffective help

[Dhaval Patel]

Hello all, I sent an email a few days ago but it might not have gotten through because I
did not have a PTR entry for my domain and the mailing list requires it.

The problem that I am having is that spambayes is not effective in identifying spam on
my new server. On my old server with a totally different setup it worked perfectly. Here
is a description of the new setup.

I am using Debian Sarge + postfix + Maildrop with spambayes. I have virtual users which
are handeled by the real user vmail. Each user has their own maildroprc file (similar to
procmailrc) which uses that specific user's spambayes db file.

I originally copied all the old db files over from my old server but I noticed more spam
getting to the unsure and INBOX folders. I noticed that the daily training was not
changing the size of the db file at all.

I removed the db file for my user and created a new one with "sb_filter.py -n -d
/home/vmail/.spambayes/dhaval.db". This file turned out to be 12288 bytes. I then
proceed to train this db file with my INBOX of  1379 messgaes and spam folder with  1336
messages.

I would think that after this many messages of fairly recent emails, I would have a very
effective db to filter spam. But the problem is that many spam emails still end up in my
unsure and INBOX.

I have read that you can adjust the thresholds, I am just using the defaults right now
as this is what I did on the old server and it worked very well.

Can anybody suggest something to help me troubleshoot this problem?


Thanks,
Dhaval