I self-host because - even without my family - I have 500+ discreet <USER>@<DOMAIN> addresses. Most mail-hosters limit the number of "aliases" you have to something well below my needs and, while many mail-hosters support <USER>+<TOKEN>@<DOMAIN> addresses to extend your aliasing, many sites you'd want to sign up with don't think they're valid addresses. Thus, I'm kind of stuck with self-hosting (with the side benefit that a mail-hoster can't scan my emails for targeted-advertising).
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