Me, as of an hour ago.

Am using the (two week) free trial, for a personal domain.

After the trial expires I can do the $19/year the Micro plan, which gives me multiple mailbox accounts for the one domain, and I could even add some additional domains at no additional charge. The downside with this Micro plan is the 200 incoming messages / day, 20 outgoing limit. I get a lot of spam so I could see a day where that 200 incoming is reached, and I don't know what happens for those messages that exceed the 200 limit. I wouldn't want to lose a message because spam caused me to exceed the allowed number of incoming messages per day. The next step up is $9 / month with 1,000 incoming messages which would be fine for a (fairly) small business, but that price is too high for a simple personal domain.

So I'll probably end up going with Tutanota for that personal domain, which I had been planning on doing, but wanted to check out this Migadu now that I've learned of it.

Migadu seems to have everything I was looking for ... catch-all, as well as aliases, and the ability to whitelist a sender for the incoming spam filter. The Webmail (webmail.migadu.com) is pretty snappy (which is my primary complaint with webmail on Tutanota). And Migadu gives me the ability to use IMAP (incoming) and SMTP (outgoing), if I wanted to do that. The set up required me to add CNAME and TXT records since I am keeping my own DNS server but once I did that it seems to be working great!