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     RFC # 561                           Abhay Bhushan (AKB) MIT-DMCG     NIC # 18516                          Ken Pogran (KP) MIT-MULTICS                                        Ray Tomlinson (RST) BBN-TENEX                                              Jim White (JEW) SRI-ARC                                                       5 September 73                              Standardizing Network Mail Headers                         One of the deficiences of the current FTP mail protocol is that     it makes no provision for the explicit specification of such     header information as author, title, and date.  Many systems     send that information, but each in a different format.  One     fairly serious result of this lack of standardization is that     it's next to impossible for a system or user program to     intelligently process incoming mail.          Although the long-term solution to the problem is probably to     add commands for specifying such information to the mail     protocol command space (as suggested inRFC 524 -- 17140,), we     hereby propose a more quickly implemented solution for the     interim.          We suggest that the text of network mail, whether transmitted     over the FTP telnet connection (via the MAIL command) or over a     separate data connection (with the MLFL command), be governed by     the syntax below:             Example:                From: White at SRI-ARC           Date: 24 JUL 1973 1527-PDT           Subject: Multi-Site Journal Meeting Announcement           NIC: 17996                At 10 AM Wednesday 25-JULY there will be a meeting           to discuss a Multi-Site Journal in the context of           the Utility.  Y'all be here.             Formal Syntax:                <mailtext>    ::= <header> <CRLF> <message>           <header>      ::= <headeritem> ! <headeritem> <header>           <headeritem>  ::= <item> <CRLF>           <item>        ::= <authoritem> ! <dateitem> !                             <subjectitem> ! <miscitem>                                                         1

NWG/RFC# 561                   AKB KP RST JEW 5-SEP-73 11:19  18516     Standardizing Network Mail HeadersRFC 561 / NIC 18516                          <authoritem>  ::= FROM: <SP> <user> <SP> AT <SP> <host>           <dateitem>    ::= DATE: <SP> <date> <SP> <time> - <zone>           <subjectitem> ::= SUBJECT: <SP> <line>           <miscitem>    ::= <keyword> : <SP> <line>           <date>        ::= <vdate> ! <tdate>           <vdate>       ::= <dayofmonth> <SP> <vmonth> <SP> <vyear>                <tdate>       ::= <tmonth> / <dayofmonth> / <tyear>           <dayofmonth>  ::= one or two decimal digits           <vmonth>      ::= JAN ! FEB ! MAR ! APR ! MAY ! JUN !                             JUL ! AUG ! SEP ! OCT ! NOV ! DEC           <tmonth>      ::= one or two decimal digits           <vyear>       ::= four decimal digits           <tyear>       ::= two decimal digits           <zone>        ::= EST ! EDT ! CST ! CDT ! MST ! MDT !                             PST ! PDT ! GMT ! GDT           <time>        ::= four decimal digits           <user>        ::= <word>           <host>        ::= a standard host name           <message>     ::= <line> <CRLF> ! <line> <CRLF> <message>                <keyword>     ::= <word>           <line>        ::= a string containing any of the 128 ASCII                             characters except CR and LF           <word>        ::= a string containing any of the 128 ASCII                             characters except CR, LF, and SP           <CRLF>        ::= CR LF           <SP>          ::= space             Please note the following:                (1) <authoritem>, <dateitem>, and <subjectitem> may each           appear at most once in <header>; <miscitem> may occur any           number of times.  The order of <authoritem>, <dateitem>,           and <subjectitem> is insignificant, but they must proceed           all occurrences of <miscitem>.           (2) The case (upper or lower) of keywords -- specifically,           'FROM', 'DATE', 'SUBJECT' ,'AT', <host>, <zone>, <vmonth>           and <keyword> -- is insignificant.  Although 'FROM', for           example, appears in upper-case in the formal syntax above,           in the header of an actual message it may appear as 'From'           (as in the example), or 'from', or 'FrOm', etc.           (3) No attempt has been made to legislate the format of           <user>, except to exclude spaces from it.           (4) The time has no internal punctuation.           (5) No provision is made for multiple authors.          We recommend that mail-sending subsystems which prefix header     information to the text of the user's message be modified                                                         2

NWG/RFC# 561                   AKB KP RST JEW 5-SEP-73 11:19  18516     Standardizing Network Mail HeadersRFC 561 / NIC 18516                    appropriately, and that other hosts recommend the above     conventions to their users.                                                                                                                                                                                                                                                                                                3