----- Original Message -----
From: "Jorey Bump" <[EMAIL PROTECTED]>
Don't rely solely on SpamAssassin. There are other techniques that are
less expensive and can eliminate obvious spam with virtually no false
positives (and others that may have an acceptable level of false
positives, though YMMV).
Note, however, that there may be equivalents available in SpamAssassin,
where you can tweak the scores to a degree you find acceptable. If you
already have the hardware to run SA in a before-queue filter, this may be
worth investigating. On the other hand, if you're under heavy load, the
other techniques can help reduce SA's overhead.
In setting up the pre-queue spam filter, I followed the instructions here:
http://www.postfix.org/SMTPD_PROXY_README.html
We have about 300 users and I figured that is not what they meant by "high
volume". Plus I asked about it on this list. And then I set up just the
lower priority mta first. When that went well, I set up the other. So far
the load has been acceptable.
Actually, one of the reasons I configured the before-queue filter was that
thedestination machine (I'm not sure what the correct technical term would
be) was getting over loaded. With the MTAs rejecting 40%-50% of spam, it's
taken a load offf the destination server.
