Here's something else from FastMail's
Improving Spam Protection help article that I didn't realize (emphasis mine):
Quote:
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We also automatically train this with spam you've deleted permanently from your spam folder, and non-spam you've moved to your Archive folder or replied to.
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So there's no need to set the Archive folder as "non-spam learning" as it looks like this is done automatically. Also makes logical sense that if you're
replying to a message, chances are it's not spam.
Even though I haven't really been having any serious problems with my spam filtering, all of this is making me rethink my approach.... particularly useful is the knowledge that the spam training database gets updated when a message is expunged from the spam folder, even with auto-purge.