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Re: [dane] Working group Last call: draft-ietf-dane-smime-11.txt

"John Levine" <johnl@taugh.com> Sat, 09 July 2016 18:15 UTC

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Date: Sat, 09 Jul 2016 18:15:18 -0000
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From: John Levine <johnl@taugh.com>
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Subject: Re: [dane] Working group Last call: draft-ietf-dane-smime-11.txt
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>Any other issues should be brought forward 

Section 3 says:

      If the local-part contains any non-ASCII characters, it SHOULD be
      normalized using the Unicode Normalization Form C from
      [Unicode52].

but section 4 says:

   Therefor, sending MUAs and MTAs supporting this
   specification MUST NOT perform any kind of mapping rules based on the
   email address.

Section 3 is wrong -- when RFC5321 says that local parts are opaque,
it means it. RFCs 6530 through 6532 deliberately did not provide any
advice on canonicalizing UTF-8 local parts, and it's inappropriate to
do it here.

R's,
John

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