Non-ASCII chars in MAIL FROM envelope

[Rob Mueller]

> Yes, but that will block possibly valid mail. Of course I don't accept
> mail with non-ASCII RCPT TO addresses because Cyrus doesn't allow it, but
> I should accept non-ASCII MAIL FROM addresses if they are valid. But Cyrus
> also refuses them. That's the real problem.

Can you turn off the 8BITMIME extension that postfix advertises? It seems 
from the RFC (http://tools.ietf.org/html/rfc4952), if 8BITMIME isn't 
advertised, then it's up to the sending side to downgrade the SMTP 
transaction to ASCII, and then you could block non-ASCII MAIL FROM 
addresses...

Rob