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Hi, here is my revised patch with email.utils.getaddresses() also decoding IDNs.
I decided to integrate IDN decoding in AddrlistClass.getaddress() instead of AddrlistClass.getaddrlist() since that function is one level lower and if somebody should ever all it directly, the conversion would not happen.
I also fixed a glitch in the docs, "versionchanged" seems to need two colons to end up in the generated HTML.
As a follow up, wouldn't it be helpful if email.Message would do the conversions directly? So when you parse a mail into a Message and access the "To" field, you get a list of tuples which are decoded properly?
For example the following test currently still fails because the quoted header value is not decoded by email.feedparser.FeedParser nor email.Message:
 def test_email_decodes_idns_and_unicode(self):
 text = '''\
To: =?utf-8?b?SMOkbnMgV8O8cnN0?= <hans@xn--dm-fka.ain>
Hello World!'''
 msg = Parser().parsestr(text)
 self.assertEqual(utils.getaddresses(msg.get_all('To')),
 [('H\xe4ns W\xfcrst', 'hans@d\xf6m.ain')])
Am I using the package wrong here or is this actually missing? email.header.decode_header seems to be able to do this already but it is not used. Would it be safe to integrate this into the email.message._sanitize_header helper?