But that's the From: comment and Subject: text where they're expected 
and already have a way to provide for encoded UTF-8 (or whatever), where 
SMTPUTF8 means we will likely begin seeing raw UTF-8 in the From: 
mailbox name, and anywhere in Received: and other headers.

This will make MUAs and thus SPAMmers jobs easier by not having to 
encode where allowed and removes an easy rejection / scoring rule, but 
other than US(ish) have had a rotten time of it using their own scripts 
so something needed to be done.  I hesitate to guess how many web site 
e-mail address validators will suddenly be wrong(er) and thus the users 
are likely going to need US-ASCII only mailbox names (aliases?) anyway.


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