Currently I have it selfhosted but it is just super annoying to maintain, I don't have the time for it.
@ConnyDuck I personally use a legacy free G Suite (Google) domain :/
I've heard good things about Fastmail - https://www.fastmail.com/
Their wildcard alias stuff https://www.fastmail.com/help/receive/alias-catchall.html supports sending from any address on a domain.
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