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I looked at the Felipe's patch and hopefully made some improvements.
Unlike Felipe's patch I didn't change the reply of the SMTP server in the tests but instead use what VRFY and EXPN actually send to index the users and lists dictionaries. If <> would be sent the lookup would fail. Similarly, when VRFY return 550 it echoed the address as received and now it's tested to be equal to something without <>.
By the way, but I was wondering:
* is the try/except really needed or just a historical artifact (why would email.utils.parseaddr raise AttributeError?)
* is the test to None correct? It was added by the fix to issue1430298 but does email.utils.parseaddr ever return None for the address? (I could only get it to return '')
I kept quoteaddr as is to make it easier to review the patch but if David confirms the above points are valid I can create new issues for them and simplify/fix quoteaddr.