Em 13 de set de 2017, à(s) 02:48:000, Andrew Sullivan <ajs@anvilwalrusden.com> escreveu:

On Tue, Sep 12, 2017 at 05:31:55PM -0300, Rubens Kuhl wrote:

Single IDN TLDs for some scripts is something being considered for subsequent procedures, so I would think of 1 or more and prevent the same UA challenges previous rounds TLDs are suffering.

Wait, what? Like "localpart@IDN-TLD"?

Nope, like localpart@domain.TLD , but where TLD is a single-character IDN in languages where a character means a whole concept in that single character.

That won't work. It would
require an update of the mail standards. (I explained this to people
many years ago when they were preparing marketing materials about
'someone@brand', and was of course ignored by people who wanted to
cash in on snake oil sales, but it still doesn't work.)

I do agree that a dotless address violates https://tools.ietf.org/html/rfc5321 , but in 5321 I couldn't find during a quick look a requirement on TLD length.