Re: Last Call: <draft-ietf-lamps-eai-addresses-05.txt> (Internationalize

On Fri, Feb 3, 2017 at 11:23 AM, Viktor Dukhovni 
<ietf-dane(_at_)dukhovni(_dot_)org>
wrote:

> > On Feb 3, 2017, at 1:59 PM, Wei Chuang <weihaw(_at_)google(_dot_)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(_at_)xn--b1adqpd3ao5c(_dot_)org

Use rfc822Name.  This is recommended.

-Wei


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

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