John Levine via Postfix-users:
> It appears that Wietse Venema via Postfix-users <wie...@porcupine.org> said:
> >3 - Wait until IETF issues guidelines for converting messages (and
> >    envelopes) from SMTPUTF8 to legacy format.
> 
> We did, it didn't work, it's mostly deprecated, and nobody does it.
> 
> See RFCs 5335 and 5336 for the failed experiment to put backup ASCII
> addresses in EAI addresses, and RFCs 6857 and 6858 for elaborate but
> almost entirely unused ways to downgrade received mail for non-EAI
> POP and IMAP clients.

RFCs 5335/6 are part of the abandoned UTF8SMTP effort. I did not
expect that there will ever be a downgrade protocol for SMTPUTF8.

        Wietse
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