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Cool idea. It's a shame it doesn't accept TLDs like .party, though.

Nor does it accept "+" characters in the email address localpart, as allowed in RFC822 (1982).

I recently learned that single words are considered valid email addresses... e.g. "foo" or "root".

Isn’t that how mail gets routed to local user mailboxes?

Yes, exactly. I just never expected an email parser to recognize those cases.