POPFile VS SpamSieve

Use the old popfile software. It's a bit janky and hasn't been updated in years, so it might be a pain to get working. That said it may just be the greatest IMAP Bayesian filter based email organizational tool ever made. It can learn how you organize emails based on ANY folder, not just spam and contrary to it's name it does has an IMAP module. I used to have this running on my old cubietruck (once a beefy... Source: about 2 years ago

I am. And yes, I did create POPFile (https://getpopfile.org/). And yes, I do work for Cloudflare, been there a while... https://blog.jgc.org/2012/02/programmer.html. - Source: Hacker News / about 2 years ago

Paul Graham proceeded to develop an open source filtering application called PopFile based on this document. I've been using Popfile since forever to filter my spam. https://getpopfile.org/. - Source: Hacker News / over 2 years ago

I’ve been using SpamSieve on my Mac, both on the Mail app on my user account and on Outlook on my wife’s. Source: over 1 year ago

However, to answer the question, there is a third party spam filtering app for MacOS called SpamSieve that does a great job of filtering spam from "ham" (e.g., good mail.) I use it for the ISP mail account that my wife and I share in order to keep us from going insane from the amount of spam that goes to that account - I have a Mac that runs 24/7 running Mail with spamsieve. Source: over 1 year ago

This is just a total workaround, but check out SpamSieve: https://c-command.com/spamsieve/. When I used Mail full time, I found its spam filtering to be pretty effective. Source: over 1 year ago