Eric V. Smith <e...@trueblade.com> added the comment:

Counterpoint: I just sent an email to "info@info.", and Thunderbird and my MTA 
(postfix) and my mail relay all accepted it. I guess it's possible that a TLD 
(especially one of the newer ones) could accept email addresses in the TLD 
itself.

It turns out that "info@info." isn't a mailbox as of right now, but I think 
it's a valid and accepted address, at least by the software listed above. And 
it could be a valid mailbox, just isn't in this particular case.

Maybe the more conservative approach is to say that "info@info." (and "a@b.", 
etc.) should be considered valid email addresses.

If you were actually trying to send email to a mailbox in the "info" TLD, I 
think most resolvers would resolve "info" as a relative domain name, which 
isn't what we'd want to happen: you'd have to specify the domain as "info.".

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<https://bugs.python.org/issue37492>
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