Re: Last Call: <draft-ietf-lamps-eai-addresses-05.txt> (Internationalized Email Addresses in X.509 certificates) to Proposed Standard

Wei Chuang <weihaw@google.com> Fri, 03 February 2017 19:38 UTC

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From: Wei Chuang <weihaw@google.com>
Date: Fri, 3 Feb 2017 11:38:40 -0800
Message-ID: <CAAFsWK2QjdkovXTgJR-6Hpj=u=MD5Mjk0srYVpoqNnK_d7_Y9Q@mail.gmail.com>
Subject: Re: Last Call: <draft-ietf-lamps-eai-addresses-05.txt> (Internationalized Email Addresses in X.509 certificates) to Proposed Standard
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On Fri, Feb 3, 2017 at 11:23 AM, Viktor Dukhovni <ietf-dane@dukhovni.org>
wrote:

>
> > On Feb 3, 2017, at 1:59 PM, Wei Chuang <weihaw@google.com> wrote:
> >
> > The document calls for SmtpUtf8Name to use U-labels or NR-LDH ASCII
> labels
> > for domain but not A-labels.  We got advice to minimize alternative
> domain
> > forms as some implementations have had bugs doing the transform.  We
> chose
> > U-labels to be consistent as the local-part is already UTF8 form and to
> > simplify implementations.  The document recommends that SmtpUtf8Name only
> > be used when the local-part requires UTF8 and otherwise use rfc822Name.
>
> Can you clarify what this means for addresses such as:
>
>         U: ietf-dane@духовный.org


Not recommended but supported by SmtpUtf8Name.


>
>         A: ietf-dane@xn--b1adqpd3ao5c.org


Use rfc822Name.  This is recommended.

-Wei


>
>
> The local part is all ASCII, so should the "U" or "A" variant be used?
>
> --
>         Viktor.
>
>