The patterns in the draft are all for EAI addresses, which are a
superset of ASCII addresses. While EAI is surely the mail of the
future, ASCII is the mail of the present. We will have ASCII-only mail
systems for a long time, and even systems that fully support EAI need
to tell whether a message can go to a remote ASCII system or if it
needs SMTPUTF8.
So it would be nice if you separated the patterns for ASCII addresses
and for EAI addresses. I realize this gets a bit grotty on the domain
side, since EAI allows UTF-8 U-labels in domain names, all of which
have an ASCII A-label equivalent.
R's,
John
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