I’ve been a Fastmail user for years, having left Gmail. It works great and have nothing be but praise for them. I use my own domain with them so if I decide to leave it’s not an issue worrying about updating people with my new email.
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Do that, it's a non-issue, though I do agree with you that it shouldn't be a thing (or at least have like a multiple year embargo on the address).
Am I missing something?