G”day:
The UASG will
(after further consultation) include the following as a Good Practice (not best
practice) guide for Downgrading:
-
The EAI Mailbox provider establishes an EAI address
and an ASCII alias when the mailbox is set up.
-
The ASCII alias will have a display name equal to the
EAI Address.
-
When a non-EAI compliant mail system is encountered,
the EAI MTA will revert with the ASCII alias and Display Name.
-
The ASCII Alias should not default to a Punycode
conversion of the mailbox name because bi-directional equivalence cannot be guaranteed.