Re: [dane] email canonicalization for SMIMEA owner names

Ian Fette (イアンフェッティ) <ifette@google.com> Thu, 11 December 2014 23:12 UTC

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Date: Thu, 11 Dec 2014 15:12:28 -0800
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To: John Levine <johnl@taugh.com>
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Subject: Re: [dane] email canonicalization for SMIMEA owner names
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I don't know how that's supposed to work with EAI. We are working towards
EAI deployment, and while we will probably have to do some normalization
(イアンフェッティ -> イアンフェッティ) I would not make some generic assumption. Until
there's more deployment and experience I don't think it's safe to make
assumptions there.

2014-12-11 14:50 GMT-08:00 John Levine <johnl@taugh.com>om>:

> >So I thought about punycode RFC3492. I know the RFC might only be for
> domains, but I asked
> >myself, why this would not be applied to a local part as well.
>
> Mailboxes can contain characters not valid in punycode.  Mailboxes in
> regular ASCII mail can contain spaces and ASCII graphics.  Mailboxes
> in EAI mail can include arbitrary UTF-8.
>
> You could imagine a punycode-like encoding for mailboxes, or perhaps
> something more like quoted printable, but punycode or A-labels aren't
> adequate.
>
> Also keep in mind that RFC 5321 says that mailbox names are opaque, so
> any case folding we do is technically wrong.  But in practice everyone
> expects case folded mailboxes to work, so even mail purists are likely
> to grumble but admit that a hack like Viktor's optional lower case is
> OK.
>
> R's, John
>
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