Have you noticed decreases over time by sending thigns to the "Learn Spam" folder? I'm a relatively new Fastmail customer - I setup a domain for some family accounts that I can manage on behalf of my aging family members so it's not receiving a lot of email _yet_ but I expect it to in the future.
replyI have noticed it for sure. The default spam filter catches most of what I'd consider spam, but the Learn Spam feature is needed for things that get through because they look legitimate. For example, I get a lot of those weird "You're an American, I'm from [China, India, etc.], we can make a lot of money if you go to all the interviews/meetings and then let me do all the work" kind of emails. They look like normal correspondence (maybe they are) so they occasionally end up in my inbox. When they do, I send them to the "Learn Spam" folder, and the next time I check my actual Spam folder I'll find that Fastmail caught several more just like it and sent them straight there.
replyFastmail here too, and my email address is older than Gmail, and probably older than a significant portion of HN posters. Fastmails spam filter just works. I get a few false negatives per month, and some months zero. I've set it to /dev/null the most obvious spam, and I can't recall the last false positive. It's happened, but extremely rarely. Google spam filter is not unique or magical.
replyAnd I never liked Gmail the client. It's not as godawful as Outlook, nothing even comes close, but it always gets in my way and does things in weird Googly ways. I'll stick with Kmail, thanks.