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+
+                                                                        
+Network Working Group                                         S. Sluizer
+Request for Comments: 785                                      J. Postel
+                                                                     ISI
+                                                               July 1981
+
+                        MAIL TRANSFER PROTOCOL:
+                      ISI TOPS20 FILE DEFINITIONS
+
+
+INTRODUCTION
+
+   This document defines the ISI TOPS20s interface between the Mail
+   Transfer Protocol (MTP) and a mail creation system (e.g., MM, HERMES,
+   etc.) in terms of the files which implement it.  The internal
+   structure and name of each file is described below.
+
+   For a complete understanding of the MTP protocol as well as the terms
+   used within this document, see RFC 780, "Mail Transfer Protocol".
+
+DESCRIPTION
+
+   For each piece of mail, the TOPS20 interface between a mail creation
+   system and MTP is comprised of two files.  The first file must be
+   named "^V[--UNSENT-MAIL-CONTROL--^V].MTP.-1", where "^V" represents
+   the character "control V" (ASCII code 026) and the generation number
+   "-1" indicates the next higher generation number (at the time of the
+   file's creation).  It is strongly suggested that the second file be
+   named "^V[--UNSENT-MAIL-FILE--^V].MTP.-1", where "^V" and "-1" are as
+   defined before.  (However, the actual file name may be chosen by the
+   mail creation system.)  Both these files reside in the directory of
+   the user who created the mail (as is currently the case with the
+   MAILER-based system).
+
+   "^V[--UNSENT-MAIL-CONTROL--^V].MTP.-1" is the control file.  It is an
+   ASCIZ file and contains all information necessary to relay the mail
+   through MTP.  It consists of a pointer to the mail text, the
+   source-path, and all destination-paths.
+
+   First is "FILE:" followed by the FULL mail text file name (which must
+   include directory name and generation number) followed by <CRLF>
+   (ASCII code 15 followed by ASCII code 12).  Note that a structure
+   name is allowed; if not given "PS:" will be assumed.  Also note that
+   for each character that must be quoted in a file name the quote
+   character (^V) must be present in the string following "FILE:".  Next
+   is "FROM:" followed by the <FROM-path> followed by <CRLF>.  Finally,
+   each destination is given in the form "TO:" followed by the <TO-path>
+   followed by <CRLF>.  The FROM- and TO-paths include surrounding angle
+   brackets (i.e., <...>) and are identical respectively to the source-
+   and destination-paths described in RFC 780.
+
+
+
+
+
+Sluizer & Postel                                                Page [1]
+
+
+                                                                        
+July 1981                                                        RFC 785
+ISI TOPS20 File Definitions                                             
+
+
+
+  ---------------------------------------------------------------------
+                       +------------------------+
+                       |FILE: <File name> <CRLF>|
+                       +------------------------+
+                       |FROM: <FROM-path> <CRLF>|
+                       +------------------------+
+                       |  TO: <TO-path> <CRLF>  |
+                       +------------------------+
+                       |           ...          |
+                       +------------------------+
+                       |  TO: <TO-path> <CRLF>  |
+                       +------------------------+
+
+        File structure for ^V[--UNSENT-MAIL-CONTROL--^V].MTP.-1
+                                Figure 1
+  ---------------------------------------------------------------------
+
+   "^V[--UNSENT-MAIL-FILE--^V].MTP.-1" is the mail text file.  (Note
+   that this is the file to which <File name> in the control file
+   refers.)  It is mail which conforms to the standard described in RFC
+   733, "Standard for the Format of ARPA Network Text Messages".
+
+DISCUSSION
+
+   The older mail creation systems create N copies of a mail text file,
+   one for each of the N addresses in the TO, CC, and BCC fields.  Each
+   file is named "^V[--UNSENT-MAIL--^V].<mailbox>^V@<host>.-1", where
+   <mailbox> and <host> are as defined in MTP, and "^V" and "-1" are as
+   defined above.
+
+   The interface between the mail creation system and MTP requires only
+   the creation of two files, regardless of the number of addresses in
+   the TO, CC, and BCC fields.  The control file contains the
+   source-path and destination-paths information as well as a pointer to
+   the mail text file.  The mail text file contains the the RFC 733
+   header and body.
+
+
+
+
+
+
+
+
+
+
+
+
+
+Page [2]                                                Sluizer & Postel
+
+
+                                                                        
+RFC 785                                                        July 1981
+                                                  Mail Transfer Protocol
+
+
+
+EXAMPLE
+
+   In this example, there were no previously existing versions of either
+   the control file or the mail text file in directory <LINDA> where the
+   message was created.  Figure 2 shows the mail text file and figure 3
+   shows the control file.
+
+   ------------------------------------------------------------------
+      DATE: April 6, 1981
+      Sender: Linda at ISIF
+      From: Jon Postel <postel@isif>
+      To: DCrocker at UDel, Cerf at ISIA
+      Cc: postel@ISIF
+      Bcc: sluizer@isif
+      Subject: MTP discussion
+      
+      Your comments on the MTP document were most helpful.  A revised
+      version will be forthcoming shortly.
+      
+      Thanks again,
+      --jon
+
+        File contents of <LINDA>^V[--UNSENT-MAIL-FILE--^V].MTP.1
+                                Figure 2
+   ------------------------------------------------------------------
+
+   ------------------------------------------------------------------
+          +--------------------------------------------------+
+          |FILE:<LINDA>^V[--UNSENT-MAIL-FILE--^V].MTP.1<CRLF>|
+          +--------------------------------------------------+
+          |FROM:<Linda@ISIF><CRLF>                           |
+          +--------------------------------------------------+
+          |TO:<DCrocker@UDel><CRLF>                          |
+          +--------------------------------------------------+
+          |TO:<Cerf@ISIA><CRLF>                              |
+          +--------------------------------------------------+
+          |TO:<postel@ISIF><CRLF>                            |
+          +--------------------------------------------------+
+          |TO:<sluizer@isif><CRLF>                           |
+          +--------------------------------------------------+
+
+          File contents of ^V[--UNSENT-MAIL-CONTROL--^V].MTP.1
+                                Figure 3
+   ------------------------------------------------------------------
+
+
+
+
+
+Sluizer & Postel                                                Page [3]
+