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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Also, whoever takes your old residence is probably not malicious (they just want the house because they want a house), but whoever takes your email address is much more likely to be malicious (as the acquisition cost is low and it scales).