rfc2076.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.

   Can include a code for the           Content-       RFC 1766, proposed
   natural language used in a           Language:      standard.
   message, e.g. "en" for English.

3.11 Size information

   Inserted by certain mailers to       Content-       Non-standard,
   indicate the size in bytes of the    Length:        discouraged.
   message text. This is part of a
   format some mailers use when
   showing a message to its users,
   and this header should not be
   used when sending a message
   through the net. The use of this
   header in transmission of a
   message can cause several
   robustness and interoperability
   problems.

   Size of the message.                 Lines:         RFC 1036: 2.2.12,
                                                       not standardized
                                                       for use in e-mail.





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3.12 Conversion control

   The body of this message may not     Conversion:    RFC 1327, not for
   be converted from one character                     general usage.
   set to another. Values:
   Prohibited and allowed.

   Non-standard variant of              Content-       Non-standard.
   Conversion: with the same values.    Conversion:

   The body of this message may not     Conversion-    RFC 1327, not for
   be converted from one character      With-Loss:     general usage.
   set to another if information
   will be lost. Values: Prohibited
   and allowed.

3.13 Encoding information

   Format of content (character set     Content-Type:  RFC 1049,
   etc.) Note that the values for                      RFC 1123: 5.2.13,
   this header are defined in                          RFC 1521: 4.
   different ways in RFC 1049 and in                   RFC 1766: 4.1
   MIME (RFC 1521), look for the
   "MIME-version" header to
   understand if Content-Type is to
   be interpreted according to RFC
   1049 or according to MIME. The
   MIME definition should be used in
   generating mail.

   RFC 1766 defines a parameter
   "difference" to this header.

   Information from the SGML entity     Content-SGML-  non-standard
   declaration corresponding to the     Entity:
   entity contained in the body of
   the body part.

   Coding method used in a MIME         Content-       RFC 1521: 5.
   message body.                        Transfer-
                                        Encoding:

   Only used with the value             Message-Type:  RFC 1327, not for
   "Delivery Report" to indicates                      general usage.
   that this is a delivery report
   gatewayed from X.400.





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   Used in several different ways by    Encoding:      RFC 1154,
   different mail systems. Some use                    RFC 1505,
   it for a kind of content-type                       experimental.
   information, some for encoding
   and length information, some for
   a kind of boundary information,
   some in other ways.

3.14 Resent-headers

   When manually forwarding a           Resent-Reply-  RFC 822: C.3.3.
   message, headers referring to the    To:,
   forwarding, not to the original      Resent-From:,
   message.  Note: MIME specifies       Resent-
   another way of resending             Sender:,
   messages, using the "Message"        Resent-From:,
   Content-Type.                        Resent-Date:,
                                        Resent-To:,
                                        Resent-cc:,
                                        Resent-bcc:,
                                        Resent-
                                        Message-ID:

3.15 Security and reliability

   Checksum of content to ensure        Content-MD5:   RFC 1864, proposed
   that it has not been modified.                      standard.

   Used in Usenet News to store         Xref:          RFC 1036: 2.2.13,
   information to avoid showing a                      only in Usenet
   reader the same article twice if                    News, not in e-
   it was sent to more than one                        mail.
   newsgroup. Only for local usage
   within one Usenet News server,
   should not be sent between
   servers.

3.16 Miscellaneous

   Name of file in which a copy of      Fcc:           Non-standard.
   this message is stored.

   Has been automatically forwarded.    Auto-          RFC 1327, not for
                                        Forwarded:     general usage.







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   Can be used in Internet mail to      Discarded-     RFC 1327, not for
   indicate X.400 IPM extensions        X400-IPMS-     general usage.
   which could not be mapped to         Extensions:
   Internet mail format.

   Can be used in Internet mail to      Discarded-     RFC 1327, not for
   indicate X.400 MTS extensions        X400-MTS-      general usage.
   which could not be mapped to         Extensions:
   Internet mail format.

   This field is used by some mail      Status:         Non-standard,
   delivery systems to indicate the                     should never
   status of delivery for this                          appear in mail in
   message when stored. Common                          transit.
   values of this field are:

   U    message is not downloaded
        and not deleted.

   R    message is read or
        downloaded.

   O    message is old but not
        deleted.

   D    to be deleted.

   N    new (a new message also
        sometimes is distinguished
        by not having any "Status:"
        header.

   Combinations of these characters
   can occur, such as "Status: OR"
   to indicate that a message is
   downloaded but not deleted.















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4. Acknowledgments

   Harald Tveit Alvestrand, Ned Freed, Olle Jdrnefors, Keith Moore, Nick
   Smith and several other people have helped me with compiling this
   list.  I especially thank Ned Freed and Olle Jdrnefors for their
   thorough review and many helpful suggestions for improvements. I
   alone take responsibility for any errors which may still be in the
   list.

   An earlier version of this list has been published as part of [13].

5. References

Ref.    Author, title                                    IETF status
                                                         (July 1996)
-----   ---------------------------------------------    -----------
[1]     J. Postel: "Simple Mail Transfer Protocol",      Standard,
        STD 10, RFC 821, August 1982.                    Recommended

[2]     D. Crocker: "Standard for the format of ARPA     Standard,
        Internet text messages." STD 11, RFC 822,        Recommended
        August 1982.

[3]     M.R. Horton, R. Adams: "Standard for             Not an offi-
        interchange of USENET messages", RFC 1036,       cial IETF
        December 1987.                                   standard,
                                                         but in
                                                         reality a de-
                                                         facto
                                                         standard for
                                                         Usenet News

[4]     M. Sirbu: "A Content-Type header header for      Standard,
        internet messages", RFC 1049, March 1988.        Recommended,
                                                         but can in
                                                         the future
                                                         be expected
                                                         to be
                                                         replaced by
                                                         MIME

[5]     R. Braden (editor): "Requirements for            Standard,
        Internet Hosts -- Application and Support",      Required
        STD-3, RFC 1123, October 1989.

[6]     D. Robinson, R. Ullman: "Encoding Header         Non-standard
        Header for Internet Messages", RFC 1154,
        April 1990.



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[7]     S. Hardcastle-Kille: "Mapping between            Proposed
        X.400(1988) / ISO 10021 and RFC 822",  RFC       standard,
        1327 May 1992.                                   elective

[8]     H. Alvestrand & J. Romaguera: "Rules for         Proposed
        Downgrading Messages from X.400/88 to            standard,
        X.400/84 When MIME Content-Types are Present     elective
        in the Messages", RFC 1496, August 1993.

[9]     A. Costanzo: "Encoding Header Header for         Non-standard
        Internet Messages", RFC 1154, April 1990.

[10]    A. Costanzo, D. Robinson: "Encoding Header       Experimental
        Header for Internet Messages", RFC 1505,
        August 1993.

[11]    N. Borenstein & N. Freed: "MIME (Multipurpose    Draft
        Internet Mail Extensions) Part One:              Standard,
        Mechanisms for Specifying and Describing the     elective
        Format of Internet Message Bodies", RFC 1521,
        Sept 1993.

[12]    H. Alvestrand: "Tags for the Identification      Proposed
        of Languages", RFC 1766, February 1995.          standard,
                                                         elective

[13]    J. Palme: "Electronic Mail", Artech House        Non-standard
        publishers, London-Boston January 1995.

[14]    R. Troost, S. Dorner: "Communicating             Experimental
        Presentation Information in Internet
        Messages: The Content-Disposition Header",
        RFC 1806, June 1995.

[15]    B. Kantor, P. Lapsley, "Network News Transfer    Proposed
        Protocol: "A Proposed Standard for the Stream-   standard
        Based Transmission of News", RFC 977, January
        1986.

[16]    1848  PS   S. Crocker, N. Freed, J. Galvin,      Proposed
        S. Murphy, "MIME Object Security Services",      standard
        RFC 1848, March 1995.

[17]    J. Myers, M. Rose: The Content-MD5 Header        Draft
        Header, RFC 1864, October 1995.                  standard






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[18]    M. Horton, UUCP mail interchange format          Not an offi-
        standard, RFC 976, Januari 1986.                 cial IETF
                                                         standard,
                                                         but in
                                                         reality a de-
                                                         facto
                                                         standard for
                                                         Usenet News

[19]    T. Berners-Lee, R. Headering, H. Frystyk:        Not an official
        Hypertext Transfer Protocol -- HTTP/1.0,         IETF standard,
        RFC 1945, May 1996.                              but the defacto
                                                         standard until
                                                         the next
                                                         version is
                                                         published

[20]    G. Vaudreuil: Voice Profile for Internet         Experimental
        Mail, RFC 1911, February 1996.

[21]    H. Spencer: News Article Format and              Not even an
        Transmission, June 1994,                         RFC, but
        FTP://zoo.toronto.edu/pub/news.ps                still widely
        FTP://zoo.toronto.edu/pub/news.txt.Z             used and
                                                         partly
        This document is often referenced under the      almost a de-
        name "son-of-RFC1036".                           facto
                                                         standard for
                                                         Usenet News


6. Author's Address

   Jacob Palme                          Phone: [phone]
   Stockholm University/KTH             Fax: [phone]
   Electrum 230                         E-mail: [e-mail]
   S-164 40 Kista, Sweden














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Appendix A:
   Headers sorted by Internet RFC document in which they appear.

   RFC 822
   -------

   bcc
   cc
   Comments
   Date
   From