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Network Working Group                                         S. SluizerRequest for Comments: 785                                      J. Postel                                                                     ISI                                                               July 1981MAIL TRANSFER PROTOCOL:ISI TOPS20 FILE DEFINITIONSINTRODUCTION   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, seeRFC 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 inRFC 780.Sluizer & Postel                                                Page [1]

July 1981RFC 785ISI 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 inRFC733, "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 theRFC 733   header and body.Page [2]                                                Sluizer & Postel

RFC 785                                                        July 1981                                                  Mail Transfer ProtocolEXAMPLE   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]