[issue20083] smtplib: support for IDN (international domain names)

[R. David Murray]

R. David Murray added the comment:

A call to formataddr will need to be added to quoteaddr.  And yes, test cases are needed.

I don't believe that the format of the HELO/EHLO message is defined by the RFC, so I don't think we can automatically parse it.  I think we just have to leave the domain name encoded as punycode there.  Regardless, though, yes I would consider that a separate issue.

If you want to work on a patch, that would be great.  For guidance on doing so, you can take a look at http://docs.python.org/devguide.

You can also help me to remember to commit 11783 after the final release of 3.4.0.

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