Re: [dane] email canonicalization for SMIMEA owner names

Nico Williams <> Thu, 11 December 2014 22:15 UTC

Return-Path: <>
Received: from localhost ( []) by (Postfix) with ESMTP id 31B0C1A039C for <>; Thu, 11 Dec 2014 14:15:03 -0800 (PST)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -1.666
X-Spam-Status: No, score=-1.666 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, IP_NOT_FRIENDLY=0.334, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=no
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id sGf9rviFZZ3K for <>; Thu, 11 Dec 2014 14:15:02 -0800 (PST)
Received: from ( []) by (Postfix) with ESMTP id F1E721A01E1 for <>; Thu, 11 Dec 2014 14:15:01 -0800 (PST)
Received: from (localhost []) by (Postfix) with ESMTP id D01BB350072; Thu, 11 Dec 2014 14:15:01 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed;; h=date :from:to:cc:subject:message-id:references:mime-version :content-type:in-reply-to;; bh=zxc9rNXuoLJJCF EGlDVblnjzHQA=; b=xuRDTlkJraK5fPIYL/RuGsUNRTrITrHTqdVt7M2djGJrI1 g3kxmpRj1Fisw+vvUMtn6UIXirxWO2ANR/wNCFqtb54+c4EsHsDcnjgywb8sSBxC jVIn/kGu8uyO1JWkKXIYEke85w1cyLN/An9wWciiESL+tPA9gAVoh8/apLeXU=
Received: from localhost ( []) (Authenticated sender: by (Postfix) with ESMTPA id 87C5435005B; Thu, 11 Dec 2014 14:15:01 -0800 (PST)
Date: Thu, 11 Dec 2014 16:15:01 -0600
From: Nico Williams <>
To: "Rose, Scott W." <>
Message-ID: <20141211221456.GI3448@localhost>
References: <>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <>
User-Agent: Mutt/1.5.21 (2010-09-15)
Cc: dane WG list <>
Subject: Re: [dane] email canonicalization for SMIMEA owner names
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: DNS-based Authentication of Named Entities <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Thu, 11 Dec 2014 22:15:03 -0000

On Thu, Dec 11, 2014 at 02:51:27PM -0500, Rose, Scott W. wrote:
> Realized the other action item I was assigned to from the interim meeting was email canonicalization for SMIMEA.  I believe it stems from Viktor Dukhovni's email to the endymail list:

Er, the case-(in)sensitivity of DNS seems irrelvant here (re: Viktor's
point (e) in that post).  After all, we'd be hashing the local-part.

All that matters is that senders, resenders, ... preserve the form given
them by recipients.

So maybe we need no canonicalization step at all.

If I say I'm foo@bar.example, and you type Foo@bar.example into your
MUA to send me e-mail, you might not reach me.

That seems fair.  And allows for aliases of any kind.  If I want to
publish SMIMEA RRs for all possible capitalizations of "foo"
@bar.example, well I can, and if I don't want to then I don't have to.