I have some level of sympathy with Google here, which isn’t something I often say.
I recently switched from Gmail to Fastmail and by and large I’m happy with it. But I’ve been surprised by the amount of spam and (particularly) phishing emails I get in a regular basis. Google might be too strict in its filtering but it does serve a legitimate purpose.
Interesting that you mention this, as I also switched to Fastmail recently and got more spam than before, but after marking it as spam for some time it now died down I think. This may also be a symptom of changing providers, where the previous provider knew the kind of spam I tended to get from past years, while Fastmail needed some time to get up to speed.
Fingers crossed that the experience will be the same for you.
I don't think a single spam email has ever crossed into my Fastmail inbox. Granted, every service I sign up for gets it's own masked email. But while the @fastmail.nl email that I chuck on my website gets a fair amount of spam, it always gets categorized correctly.
Fastmail seems to go through periods where they're a little slower to adjust to new spam techniques, and they do rely on users filtering somewhat. About twice a year a few will slip through, but if I report them as spam they soon stop.
I've been a happy customer otherwise for years, for what its worth.
I've considered this switch. You're saying that previously gmail was dropping the emails, or they were landing in spam?
Long time Fastmail customer. Let it learn a bit about your inbox. I barely see any spam these days that’s not been caught. Except LinkedIn, that somehow goes through