MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text
This RFC 2047 was published in 1996
STD 11, RFC 822, defines a message representation protocol specifying considerable detail about US-ASCII message headers, and leaves the message content, or message body, as flat US-ASCII text.
This set of documents, collectively called the Multipurpose Internet Mail Extensions, or MIME, redefines the format of messages to allow for
RFC 2047 introduction
RFC 2045 describes a mechanism for denoting textual body parts which are coded in various character sets, as well as methods for encoding such body parts as sequences of printable US-ASCII characters.
This memo describes similar techniques to allow the encoding of non-ASCII text in various portions of a RFC 822  message header, in a manner which is unlikely to confuse existing message handling software.
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Related Request for Comments
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