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> If a Gmail user sends an email to my self-hosted server, there is nowhere to authenticate me to.

They'll probably just force external recipients to create a Google account and verify control over the independent email address...

Exactly this. No different from if someone shares a Google Doc with your email address.

And it makes sense. It's the logical way to prove you have access to the email account.

But that's not end-to-end encryption, that's a pastebin with a login