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

Viktor Dukhovni <ietf-dane@dukhovni.org> Fri, 03 February 2017 19:23 UTC

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Subject: Re: Last Call: <draft-ietf-lamps-eai-addresses-05.txt> (Internationalized Email Addresses in X.509 certificates) to Proposed Standard
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Date: Fri, 3 Feb 2017 14:23:53 -0500
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References: <B9F32633ED13374379C6E0D1@PSB> <20170124193109.68919.qmail@ary.lan> <20170201210155.GI28349@mournblade.imrryr.org> <D45CE6A5317D4B373CD90742@PSB> <CAAFsWK1kQUUZrq9Cs47+jYbEJXW+hQN8gzKb+2qjXYdfYhRFzw@mail.gmail.com>
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> 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
	A: ietf-dane@xn--b1adqpd3ao5c.org

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

-- 
	Viktor.