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encoding header
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... character set includes 8-bit data, a Content-Transfer-
Encoding header field and a corresponding encoding on the data are
required in order to transmit the body via some mail transfer
...
... bit mail-ready representation using one of these
transformations and include the appropriate Content-Transfer-
Encoding header field, unless the underlying transport mechanism
supports non-seven-bit ...
... Robinson, D. and R. Ullmann, "Encoding Header Field for Internet Messages", RFC 1154(-> 1505exp), Prime Computer, Inc., April 1990. ...