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There is a rudimentary HOWTO at <A HREF="http://forums.gentoo.org/viewtopic.php?t=28392">the Gentoo forums</A> for integrating SpamAssassin and f-prot with Courier-MTA.

Integrated into CommuniGate Pro

SpamAssassin plugin for CommuniGate Pro 4.x

Installation and usage instructions can be found at
http://www.stalker.com/CGPSpamCatcher/#Integrate

ftp://ftp.vsu.ru/pub/apps/CGatePro/sa-cgp.c
ftp://ftp.vsu.ru/pub/apps/CGatePro/Mail-SpamAssassin-2.63-ai.diff (required)

Build:
AIX: cc_r sa-cgp.c libspamc.c utils.c -o sa-cgp
Solaris: cc -mt sa-cgp.c libspamc.c utils.c -o sa-cgp -lsocket -lnsl