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