Re: [dane] email canonicalization for SMIMEA owner names

"John Levine" <johnl@taugh.com> Fri, 12 December 2014 18:06 UTC

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Date: 12 Dec 2014 18:05:51 -0000
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From: "John Levine" <johnl@taugh.com>
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Subject: Re: [dane] email canonicalization for SMIMEA owner names
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>Speaking of canonicalisation:
>
>1. What about X+Y@Z - for almost all MTAs, this is the same as X@Z.

Only if by almost all you mean sendmail and postfix.  Subaddresses are
popular here in nerd land but they're almost unknown elsewhere.  Yahoo
has an obscure subaddress feature which nobody uses.

>2. What about GMail's a.b.c@gmail.com == abc@gmail.com ==
>ab.c@gmail.com == a.bc@gmail.com?

That's a better question.

Having written a few books aimed at non-technical users and gotten a
certain number of comments, it's clear that everyone expects upper and
lower mailbox names to be equivalent, but have no general expectations
about dots, + - and the like.

The point about UTF-8 characters is a good one, but until there's a
lot more experience with EAI, I don't see how we can say anything about
a similar canonicalization.

R's,
John