bug#51733: 27.1; Detect impossible email addresses better

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Is that expectation reasonable?  I can show you many email addresses
> that violate that.

It depends on what you mean.  There are no valid email addresses that
have non-ASCII name parts -- when we're talking wire format (RFC2047
etc), which is what that function is parsing.

But displayed email addresses may have any characters, of course.

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