Re: [dane] case sensitivity and draft-ietf-dane-smime / draft-wouters-dane-openpgp

"Olle E. Johansson" <oej@edvina.net> Mon, 09 September 2013 18:43 UTC

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From: "Olle E. Johansson" <oej@edvina.net>
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Date: Mon, 09 Sep 2013 20:43:11 +0200
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Subject: Re: [dane] case sensitivity and draft-ietf-dane-smime / draft-wouters-dane-openpgp
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9 sep 2013 kl. 17:16 skrev Viktor Dukhovni <viktor1dane@dukhovni.org>:

> On Mon, Sep 09, 2013 at 10:52:26AM -0400, Paul Wouters wrote:
> 
>> Mail servers and mail clients do not treat email addresses as
>> case-insensitive. When encoding an LHS with base32, the case matters.
>> Using the wrong case will cause you to not find the SMIMEA / OPENPGPKEY
>> record.
> 
> This is not accurate.  While domain part of an email address is
> case-insensitive, the case-sensitivity of the local-part  is a
> local matter.  SMTP relays MUST NOT change the case of the local
> part of envelope addresses.  On arrival at the destination domain,
> that domain's mail system may choose to treat local-parts case
> insensitively, but remote systems must not rely on this.
> 
> Therefore, <Paul@example.com> and <paul@example.com> are a-priori
> distinct addresses except perhaps in the hands of the MTAs that
> handle example.com mail.
> 
> [ The fact that most systems are in practice case-insensitive is not
>  sufficient to invalidate the right of some to be case sensitive as
>  they see fit. ]

Just for the record - in SIP the username part is case-sensitive.

/O