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I can see a value in a smarter email-inbox sorting algorithm - but only because all major players (except google which I don't trust with my mails) have abandoned bayesian email filtering with training. This was standard in 2005 in such basic clients such as the Opera browser, but somehow we lost this technology along the way.

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I was an original Thunderbird pre-1.0 (from 2003) user and prior to that, Netscape Mail, and am quite certain it has had bayesian spam filtering all this time, at least since the late ‘90s. That was a headline feature in the early days. My first email account used POP3 through a shared web host for my own domain in that era.

Edit: Yes it’s still there https://support.mozilla.org/en-US/kb/thunderbird-and-junk-sp...

I can't recall the name, but I vaguely remember a Bayesian spam filter for arbitrary POP3 accounts in the 2000s that had a local web frontend, and how excited I was at its effectiveness.

I believe that the shift from "my one computer" to multiple clients (computer + phone + webmail) probably has something to do with it. Even with IMAP sharing state, you still don't have a great way to see and control the filtering, except by moving things in/out of spam folders.

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