From: Eliot Lear <lear(_at_)klapsmühle(_dot_)ch>
What is the right conversion?
There isn't any. Until we have EAI standards, there is no way to
represent non-ASCII characters in e-mail addresses in a standards
compliant mail message.
Some years ago we had a modest flame fest about how to sign a message
body that contains bare CR or LF characters. The answer was "don't do
that", since DKIM signatures only apply to valid 822/2822/5322
messages. This is the same issue.
I entirely realize that for the large majority of the world that
writes its names in non-ASCII characters, this is a gaping hole which
has provoked a variety of more or less sound and more or less
incompatible workarounds. But it's one that EAI has to solve for all
e-mail, not one to which we can unilaterally apply a band-aid in DKIM.
R's,
John
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