On Mar 15, 2015, at 4:52 PM, John R Levine <[email protected]> wrote:

> As I've said before, the reality that mail systems do fuzzy matching on 
> incoming addresses, but not in a way that is at all consistent, is a big 
> problem.  I don't think it makes sense to try to advance OPENPGPKEY or SMIMEA 
> or _mailbox until we and the people who know about mail figure out what to do 
> about it.  I'm asking them to take a look.

Fuzzy matching on "mailboxes" bites in several places, far beyond email.  While 
way out of scope of everything being discussed here, I think the idea of having 
a cut point handoff from the domain certification, to the 'user' certification, 
is something we can't ignore.

Sendmail's plus-addressing scheme is a deployed example of that sort of usage.  
Given [email protected], we have all the bits to validate the RHS of the 
@, and the initial token of the LHS.  But with IoT smacking us in the face, 
sub-personal locators are very quickly going to become a fact of life.  How to 
deal with the bits starting at the '+' is scary.  And out of context here.  But 
it can't be ignored.

--lyndon

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