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.

R's,
John
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