On Wed, 24 Aug 2022, John Levine wrote:
Many people believe that but it's not entirely true.
While most mail systems treat upper and lower case in local parts the same,
I have occasionally seen setups where you can send mail to sek...@example.com
and other capitalizations bounce.
In my 30 years of SMTP email I have never run into this. "The expectation
of the many, outweigh the expectation of the one" :)
Hence I would tell people that if they make their names case sensitive
they are likely to be sorry, but I wouldn't try to enforce anything.
That sounds like a draft that could contain a SHOULD NOT or even a MUST
NOT. Already better than the current status quo of an IETF requirement
being completely obsoleted by real world deployments of billions of mail
boxes.
Paul
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