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Annotation of researchv10no/lbin/Mail/manual/mail7.nr, revision 1.1

1.1     ! root        1: .bp
        !             2: .sh 1 "Format of messages"
        !             3: .pp
        !             4: This section describes the format of messages.
        !             5: Messages begin with a
        !             6: .i from
        !             7: line, which consists of the word
        !             8: .q From
        !             9: followed by a user name, followed by anything, followed by
        !            10: a date in the format returned by the
        !            11: .i ctime
        !            12: library routine described in section 3 of the Unix Programmer's
        !            13: Manual.  A possible
        !            14: .i ctime
        !            15: format date is:
        !            16: .(l
        !            17: Tue Dec  1 10:58:23 1981
        !            18: .)l
        !            19: The
        !            20: .i ctime
        !            21: date may be optionally followed by a single space and a
        !            22: time zone indication, which
        !            23: should be three capital letters, such as PDT.
        !            24: .pp
        !            25: Following the
        !            26: .i from
        !            27: line are zero or more
        !            28: .i "header field"
        !            29: lines.
        !            30: Each header field line is of the form:
        !            31: .(l
        !            32: name: information
        !            33: .)l
        !            34: .i Name
        !            35: can be anything, but only certain header fields are recognized as
        !            36: having any meaning.  The recognized header fields are:
        !            37: .i article-id ,
        !            38: .i bcc ,
        !            39: .i cc ,
        !            40: .i from ,
        !            41: .i reply-to ,
        !            42: .i sender ,
        !            43: .i subject ,
        !            44: and
        !            45: .i to .
        !            46: Other header fields are also significant to other systems; see,
        !            47: for example, the current Arpanet message standard for much more
        !            48: on this topic.
        !            49: A header field can be continued onto following lines by making the
        !            50: first character on the following line a space or tab character.
        !            51: .pp
        !            52: If any headers are present, they must be followed by a blank line.
        !            53: The part that follows is called the
        !            54: .i body
        !            55: of the message, and must be ASCII text, not containing null characters.
        !            56: Each line in the message body must be terminated with an ASCII newline
        !            57: character and no line may be longer than 512 characters.
        !            58: If binary data must be passed through the mail system, it is suggested
        !            59: that this data be encoded in a system which encodes six bits into
        !            60: a printable character.
        !            61: For example, one could use the upper and lower case letters, the digits,
        !            62: and the characters comma and period to make up the 64 characters.
        !            63: Then, one can send a 16-bit binary number
        !            64: as three characters.  These characters should be packed into lines,
        !            65: preferably lines about 70 characters long as long lines are transmitted
        !            66: more efficiently.
        !            67: .pp
        !            68: The message delivery system always adds a blank line to the end of
        !            69: each message.  This blank line must not be deleted.
        !            70: .pp
        !            71: The UUCP message delivery system sometimes adds a blank line to
        !            72: the end of a message each time it is forwarded through a machine.
        !            73: .pp
        !            74: It should be noted that some network transport protocols enforce
        !            75: limits to the lengths of messages.

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