[eproxus]

For a long time I thought the spam filtering was not very good, but what eventually led to that was my own mistake of setting "learn as spam" on the spam folder itself. In Fastmail's own words:

> Note: We recommend that you do not mark your Spam/Junk Mail folder to automatically learn as spam. This can create a false positive feedback loop. Imagine an email is incorrectly classified as spam, put in your Spam/Junk Mail folder, and then learned as spam. That means future emails that aren't spam are now more likely to be incorrectly marked as spam, sent to your Spam/Junk Mail folder, and learned as spam. Only mark folders to learn as spam if they're folders you manually move email to.