I just read on Phoronix about rspamd. I wasn’t familiar with it, but it seems an improvement over SA.
Rspamd is a fast, free and open-source spam filtering system. Compared to the de-facto standard SpamAssassin, Rspamd is tested to be 13 times faster. In comparison, Rspamd also has valuable features such an event driven, modular design, UTF-8 support and for the command prompt shy user an embedded web interface. These features increase usability and above all: performance.
Do we want this in MIAB? I see rspamd was mentioned on MIAB’s Github in 2015 but it was closed due to inactivity.