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by lobster_johnson 4306 days ago
Not very. It's basically SpamAssassin [1].

I have trained it with tens of thousands of emails, but it keeps letting obvious stuff through. On the other hand, I have had zero problems with false positives, which used to be a huge problem back when I was using Gmail.

[1] https://www.fastmail.fm/help/technical/spamchecks.html