On Thu, Apr 06, 2023 at 04:57:51PM +1000, Sean Gallagher via Postfix-users
wrote:
> What a can of worms..
> IDNA2003 allowed UTF8 in domain names
IDNA specified an encoding system for mapping UTF8 labels to
ACE-prefixed LDH labels that can be used in DNS. The resulting data in
DNS (in zone files and on the wire) is ASCII LDH.
> IDNA2008 subsequently forbid non-ASCII characters in domain names.
This is false. IDNA tweaked the encoding rules, mostly to make sure
that both:
A-label -> valid U-label -> A-label
valid U-label -> A-label -> valid U-label
are the identity function.
The SMTP HELO name was always 7-bit, none of the above changed this.
--
Viktor.
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