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Downgrading (1)
When some portion on the delivery route is not IMA-compliant,
Bounce mail to sender
Downgrade to be compatible with RFC2821/2822

SMTP Envelope needs to be downgraded to ASCII
Sender specifies both IMA and ASCII address (ALT-ADDRESS)
Automatic conversion to ASCII Compatible Encoding from IMA(may require another SMTP parameter)

Headers need Conversion of UTF-8 data to ASCII
How to encode depends on each header
PPT Version