On Tue, Mar 31, 2020 at 10:56 AM Damian Lukowski <[email protected]> wrote:
> > I don't see any reason to exclude them. We could do this:
> >
> > autbserv-id = sub-domain *("." sub-domain)
> >
> > Where sub-domain is imported from 5321 for ASCII mail and 6531 for EAI
> mail.
>
> Does this mean that a parser would need to know if the message has been
> sent with SMTPUTF8 in order to pass or refute U-labels?
>
You don't need SMTPUTF8 to handle IDNs.
--Kurt
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