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Network Working Group                                         S. SluizerRequest for Comments: 786                                      J. Postel                                                                     ISI                                                               July 1981MAIL TRANSFER PROTOCOL:ISI TOPS20 MTP-NIMAIL INTERFACEINTRODUCTION   This document defines the ISI TOPS20s interface between the Mail   Transfer Protocol (MTP) and the Network Independent Mail Protocol   (NIMAIL) 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",RFC784 "ISI TOPS20 Implementation", andRFC 785 "ISI TOPS20 File   Defintitions".  The NIMAIL is documented in IEN 169, "A Simple   NIFTP-Based Mail System".DESCRIPTION   1. NIMAIL to MTP      NIMAIL will present mail for processing by MTP using the files      specified inRFC 785.   2. MTP to NIMAIL      MTP will present mail for processing by NIMAIL in files of the      following form:         address <CR><LF>         address <CR><LF>         address <CR><LF>         <CR><LF>         Via: USC-ISIE; date-time <CR><LF>         header          .          .          .         <CR><LF>         body          .          .          .         Where each address is of the form:Sluizer & Postel                                                Page [1]

July 1981RFC 786ISI TOPS20 MTP-NIMAIL Interface            user%host%host%host@host         And each address in the same file has the same "@host" part.         The date-time will be in the default TOPS20 ODTIM format         "dd-mmm-yy hh:mm:ss" (24 hour time).      The files will named "arbitrary.NIMAIL.-1", where "arbitrary" will      be somesort of date-time encoding for human uses.  The NIMAIL will      not care in the least what the "arbitrary" part is.  These files      will be placed into the NIMAIL directory on ISIE.DISCUSSION   The NIMAIL and MTP will each perform a transformation of the address   information to create the appropriate input for the other system.   NIMAIL to MTP      The mail that arrives at NIMAIL with the information         joe%hostx%hosty%hostz@isie      will be presented to MTP with the information         FROM: <NIMAIL@ISIE>         TO: <@hostz,@hosty,joe@hostx>   MTP to NIMAIL      The mail that arrives at MTP with the information         FROM: <sam@SRI-NIC>         TO: <@ISIE,@hostz,@hosty,joe@hostx>      will be presented to NIMAIL with the information         joe%hostx%hosty@hostz         Via: ISIEPage [2]                                                Sluizer & Postel