On a somewhat tangentially related note, do you really
need to use spamassassin? I find I solved most of my
spam problems by:
1) Nolisting
http://en.wikipedia.org/wiki/Nolisting
I extend this approach (using iptables) to have primary
_and secondary_ set to -j REJECT TCP connections, tertiary
that accepts and works, and 1-3 after that with -j TARPIT.

Downside - you need multiple IPs.

2) Spamhaus RBLs

3) clamav-milter

This kept me almost completely spam free for years.
Recently, I implemented an additional filter:

4) uri-milter (no package - you'll have
to compile it yourself)
This filters based on URIs in the body of the email,
and I only implemented it due to one particular type
of spam that was getting past the other levels of
filtering.

clamav-milter and uri-milter are both implemented in
C, i.e. they are fast and relatively lightweight,
or at least as lightweight as anything that has to
process the whole body of the email can be.

You may find the above filtering stack is sufficient
for your needs, and it will put a LOT less strain on
your limited hardware than something as bloated and
slow as spamassassin.

Gordan
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