spamassassin-3.3.0-rc1 was released today. Here are extensive release notes upstream of many improvements and bug fixes since 3.2.5. 3.3.0 trunk has generally of better quality in both stability and spam detection capability than 3.2.5 for many months now. I personally have been running snapshots leading to this beta release on my production RHEL5 server since early 2009. We expect almost no changes are necessary before 3.3.0 final to be released during early January 2010. This is the LAST CHANCE to test and report any problems.
RHEL5: I personally use this scratch builds. You will need some new perl module dependencies from EPEL5. The plan is to push spamassassin-3.3.0 final + new perl modules to RHEL-5 sometime during 2010 after extensive testing. I especially need test feedback of systems currently using spamassassin-3.2.5 with Mailscanner, Amavis or Mimedefang.
Optional packages: These packages are not required, but they probably will improve your spam filtering results.