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Thank you both for your work on this. The patch I committed is a combination of my _addr_only, Filipe's tests, and Catalin's modifications to those tests. quoteaddr, although in the __all__, is not documented and is really an implementation detail, as is the new _addr_only. So I am only testing them indirectly through the documented parts of the API (I added a test for <> address, and one for an IDNA encoded address).
Catalin, I think you are correct about the try/except/None stuff. As far as I can tell it is left over from the old days before the email package and its philosophy of never throwing parsing errors. Nowadays if parseaddr throws an error, it is a bug. That's a refactoring not a bug fix, though, so I didn't backport it.