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 |