Going from procmail based SA to spamass-milter produces more spam

[Ken Long]

Hello.

I am running a mail server that is running Debian Sarge.

I have SpamAssassin installed with a package version of 3.0.3-2sarge

Recently, we decided to use spamass-milter instead of doing it via
procmail.  So, I installed the debian package for spamass-milter 0.3.0.
After installing it, I had complaints from existing users (including
myself) that the amount of spam getting through had drastically
increased.

The SA configuration had not changed.  The only thing that had changed
was that we implemented the milter.

My /etc/defaults/spamass-milter file has this option to it:

OPTIONS="-u nobody -x -i 127.0.0.1 -i 216.54.58.0/24 -i 192.168.0.0/16
-i 172.17.0.0/16 -r -1"

(I since took out a bunch of the extra networks, but that does not seem
to have made much difference)

What would cause this to happen and is there anything I can do to fix
it?

Any help is greatly appreciated!

-Ken