[caymanjim]

You're going to get an astronomical amount of junk mail with a catchall email address. Google is great at filtering spam, but not perfect. If you're running your own mail server, you're going to have a hard time dealing with it, even if you use SpamAssassin and other tools. It's also going to get worse over time, because every address that accepts delivery is going to get added to a database for future spamming.

I use Postfix and ViMbAdmin to manage my whitelist via a simple web UI, and I don't find it to be onerous. I don't sign up for new services every day, and it takes about ten seconds to add or delete a service-specific alias.

[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.

[zufallsheld]

I have a catch all address vor two years now and I never got spam through an address that I didn't create by myself.