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
A: ietf-dane(_at_)xn--b1adqpd3ao5c(_dot_)org
The local part is all ASCII, so should the "U" or "A" variant be used?
--
Viktor.