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header field
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(2) Recognize the Content-Transfer-Encoding header field
and decode all received data encoded by either quoted-
printable or base64 ...
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(4) Recognize and interpret the Content-Type header field,
and avoid showing users raw data with a Content-Type
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... the resulting messages must be consistent with those produced by the
model described here. For example, a message with the following
header fields:
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... [Note that the blank between the boundary and the start
of the text in this part means no header fields were
given and this is text in the US-ASCII character set ...
... (12) Added a clarifying note to the basic syntax rules for
the Content-Type header field to make it clear that the
following two forms:
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... Sirbu, M., "Content-Type Header Field for Internet Messages", RFC 1049hist, CMU, March 1988. ...