Re: [dmarc-ietf] Recommend adoption of draft-levine-appsarea-eaiauth as WG work

"John Levine" <johnl@taugh.com> Tue, 11 December 2018 00:42 UTC

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From: "John Levine" <johnl@taugh.com>
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Subject: Re: [dmarc-ietf] Recommend adoption of draft-levine-appsarea-eaiauth as WG work
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In article <CABuGu1rP9Udnzw4Ox1O501+OQc1LeHrQ1BUGGytCU8=-iiyL8w@mail.gmail.com> you write:
>> what was  already implicit; s and l macros will never match if the local
>> part of the email address contains non-ascii characters.
>>
>
>Why not? If the non-ASCII (or non-7bit) characters are puny-coded, it seems
>like they should be able to match without any problems.

No.  No, no, no, no.

In EAI mail, e-mail address local parts are UTF-8.  You cannot
translate them into anything else and you very specifically cannot
"punycode" them.

Using the term punycode in IDNA2003, which is obsolete, was a serious
mistake, since it led people to all sorts of bogus conclusions.

In IDNA2008 domain names, and only in domain names, there are U-labels
which contain a large subset of UTF-8 encoded Unicode, and there are
A-labels which consist of ASCII starting with XN--.  There is a
two-way algorithm to convert between U-labels and A-labels.  There is
no punycode.

R's,
John