I intend to switch to rspamd soon, which has built-in greylisting. However, in my test run with rspamd I did not get good enough results because my current Spam

I intend to switch to rspamd soon, which has built-in greylisting. However, in my test run with rspamd I did not get good enough results because my current SpamAssassin setup relies heavily on rejecting spam that hits two or more content filters (bayes, pyzor, etc.). I will need to implement at least a pyzor plugin for rspamd before I can switch. rspamd, in addition to bayes filtering, has it's own fuzzy fingerprinting system. You can use your own fingerprint db and/or a public one. The public one that is configured in rspamd by default didn't seem to catch any of the spam I get though.