https://bugs.exim.org/show_bug.cgi?id=2669
--- Comment #12 from Jeremy Harris <jgh146exb@???> ---
UTF-8 is acceptable, even required, in domain lists, because an original UTF-8
domain from an SMTP transaction is maintained in that form. I'm not sure about
hostnames though; anything we get from DNS should be A-label form, and
hostlists
used for checking received connections would be comparing against that.
Hostlists
used by routers/transports for destinations could, I think, potentially use
U-label form. It'd be interesting to hunt for any standards defining
disallowed
UTF-8 chars in DNS. Nbsp sounds like one, but who knows? And does it vary for
different RR types?
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