[Exim] SPAM control

Hello,

I'd like to install some resource-friendly SPAM control software for
Exim, like SpamAssassin is. Unfortunetly, my mail server is
running pretty old hardware, so SpamAssassin easily kills it with a
load. Perl doesn't work good for us, though Mailman's Python works
fine. I've tried a lot of tuning option for SpamAssassin, but still
it needs too much resources. However, I'd like to install some SPAM
control, because a lot of SPAM really abuses our customers.

Thank you and looking forward your help!

--
Alexander Prohorenko