[moonlighter]

I disagree with the "astronomical amount of junk mail" statement. I've been using FastMail with a catchall email address for years, and get very little spam; most of which is correctly classified as such (I did have to 'train' FastMail for a while with custom spam/no spam folders though).

[mmcclure]

Yeah, I've also been using this approach for years now and see significantly less spam on this personal, catch-all account than I do on my work email (both are Gsuite). I will say I was honestly surprised at just how little email I see coming into random email addresses via the catch-all; over years I'd say (anecdotally) that number basically rounds down to 0 versus my "legitimate" email.

Most of the time I do see an influx of spam it's because of one of the aliases clearly having made its way on a list, so I'd say the system is working as intended.