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Issue 1690608 addresses part of this issue, and issue 11783 will address the IDNA part.
From my point of view those two issues solve this problem from the perspective the email package infrastructure and *current* API. In the email6 API I do plan to have an address helper class that will make managing addresses more conveniently OO, but that is part of the whole email6 process and I don't feel a need any longer to keep this issue open. There's no good value for 'resolution' to express the resolution here (I've accepted the idea but not the code), so I used 'remind', since I will be coming back to the idea in a little while.