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Network Working Group                                          J. PostelRequest for Comments:  808                                           ISI                                                            1 March 1982SUMMARY OF COMPUTER MAIL SERVICES MEETINGHELD AT BBN ON 10 JANUARY 1979Introduction:   This note is a very belated attempt to document a meeting that was   held three years ago to discuss the state of computer mail in the   ARPA community and to reach some conclusions to guide the further   development of computer mail systems such that a coherent total mail   service would continue to be provided.   Some important conclusions were reached at this meeting which limited   the extent to which mail systems were to incorporate new features in   the context of the existing service and specifications.   Unfortunately, this meeting and the conclusions were not documented,   and the specifications were not revised.  This has led to continuing   problems in the mail service.   Due to the passage of time these notes are necessarily quite   incomplete.  It is thought that there were a number of other   attendees.  I would like to express my appreciation to those who   helped provide this information, especially Vint Cerf, Jack Haverty,   Danny Cohen, Bob Thomas, and Debbie Deutsch.The Meeting Announcement:   On 10 January 1979 we are holding a meeting at BBN in Cambridge, MA,   starting at 0930, to discuss Message Service support on the ARPANET.   The purpose of the meeting is to provide a basis for any   standardization of efforts which may be necessary.  We will take   stock of the various message services currently available on the   ARPANET, discuss problems which have been encountered between   different message systems, review current protocols and review   forthcoming developments.  An agenda is given below.  Each of you   should be prepared to discuss current problems you are aware of and   any developments which impact future message service.Postel                                                          [Page 1]

Summary of Computer Mail Services Meeting                   1 March 1982RFC 808The Meeting Agenda:   1.  Present State of Affairs      .  Survey of Message Systems      .  Current Problems      .  Format Protocols -RFC 560, 680, 733      .  Distribution Service      .  Documentation   2.  Future Developments in Message Technology      .  Multi-Media Techniques      .  Impact of Personal Computers      .  Distributed Service         -  NSW Project         -  Internetwork Addressing and Forwarding      .  Other   3.  Impact of Charging Technology on the Message Service      .  Protocols      .  Distribution of Messages   4.  Managing the Message Service   5.  Supporting the Message ServiceTalks:   1.  Duane Adams opened the meeting.  He indicated that we should be   concerned about computer mail as a total message service (not just as   a local user interface), and asked what impact on the message service   the developments in internetting and multimedia would have.   2.  Dave Farber gave a bit of history of mail systems, listing the   names of all the systems anybody had every heard of (seeAppendix A).   It was noted that most of the mail systems were not formal projects   (in the sense of explicitly sponsored research), but things that   "just happened".   3.  Ted Myer chaired a discussion of current problems in mail   systems, and the following made comments as well: R. Stallman,   D. Farber, P. Santos, K. Harrenstien, R. Kunzelman, T. Knight,   B. Thomas, D. Lebling, J. Haverty, D. Cohen, D. Adams, V. Cerf, and   A. Vezza.      This was mostly gripes about what this or that mail system did      wrong.         Topics included use of MLFL instead of MAIL, fully qualifying         the all the usernames with hostnames on all the addresses,         immediate feedback about the addressed user having a mailbox at         the destination host or getting an error message later, hostPostel                                                          [Page 2]

Summary of Computer Mail Services Meeting                   1 March 1982RFC 808         table update problems, strange FTP replies (e.g., "System going         down in 10 minutes"), and addressing issues.      There were also some things mentioned that might be added to the      current systems.         Topics included virtual hosts (e.g., NSW), internetted hosts,         authentication, message identification, duplicate detection,         spoofing, multicopy delivery, limits on receipt, program to         program mail, structured typed data, graphics, fax, and voice.      At the end of this session there was a statement that further work      was putting patches on patches and that we should make a      commitment to a version 2 system.  There should be an edict that      says "this is it", and the current mail service should be frozen.   4.  Debbie Deutsch talked about some work being done at BBN on   multimedia mail.      Debbie discussed the alternatives for including other types of      data (voice, graphics, fax, numeric, executable) in messages, and      for structuring messages to identify and interrelate the different      types of data.  The main choice to make is between encoding the      data in ASCII and using keyword field identifiers, or using a      binary typed structured format.  The current work is attempting      integrate fax data handling into an existing text mail system.      Copies of the viewgraphs were distributed.   5.  There was a discussion of Personal Computers.      Tom Knight gave a short discription of the Lisp Machine project.      There was some general discussion of the impact of personal      computers on mail services.  The main realization being that the      personal computer will not be available to handle incoming mail      all the time.  Probably, personal computer users will have their      mailboxes on some big brother computer (which may be dedicated to      mailbox service, or be a general purpose host) and poll for their      mail when they want to read it.  There were some concerns raised      about accountability and accounting.   6.  Bob Thomas talked about the ideas for routing mail between   regular mailboxes on ARPANET Hosts and mailboxes of NSW users.      The main point of interest is that an NSW user is not a user of a      specific host, thus, the notion of a mailbox being "user@host"      dosen't work.  Bob suggested that one might think of NSW as a      virtual host.  The implementation of this mail service for NSWPostel                                                          [Page 3]

Summary of Computer Mail Services Meeting                   1 March 1982RFC 808      users is constrained to minimize the amount of new code and      changes to existing programs.  Bob described his ideas for address      formats for sending messages between NSW users, from NSW users to      ARPANET users, and from ARPANET users to NSW users.  The last      being the most difficult to pull off.  Copies of the viewgraphs      were distributed, and copies of a memo were distributed (BBN NSW      Working Note 24).   7.  Jon Postel talked about the ideas he had for internet multimedia   mail systems.      Two aspects of this were a general approach to addressing and      routing for mail distribution, and using a structure of typed data      elements to represent the message data and control.   8.  There was some discussion of other work in mail services.      Someone talked about the work of ANSI X3 S33 on message structure      and protocol.      Dave Farber described the activities of IFIP TC 6.5 on      international message services.      Ted Myer described the interests of the US Congress Office of      Technology Assesment (OTA) in electronic communication.General Discussion:   It was suggested that we need to view the problems in building a   total message service rather than individual message systems.   In general it was felt that the current message service was somewhat   out of control with incompatible varations and extensions.  There   were several instances where a minor change to one mail system led to   unexpected problems in another mail system.   In part, the reason for this seemed to be the varations allowed by   the protocol, and especially the partial implementation of the   protocol by most systems.   The general approach to resolving these problems was two fold:      First, a few minor further changes were to be allowed, but in      general full implementation of the protocol (RFC 733) was not to      be carried out. In case of questions about a particular change      Duane Adams was to decide if it would be allowed ot not.  The goal      in this approach was to quickly stabilize the mail service in a      useful state.Postel                                                          [Page 4]

Summary of Computer Mail Services Meeting                   1 March 1982RFC 808         In particular, if a small number of senders are doing something         that is incompatible with the total service, they will be asked         to stop doing it.  Or, if a small number of receivers can't         handle something that most systems do, they will be asked to         handle that feature.      Second, work was to be focused on the definition and      implementation of a next-generation mail service which would      attack all the existing problems and include facilities for voice,      fax, and graphics data.   The use of structured data in the next-generation mail service was   approved.  Jack Haverty noted thatRFC 713 specified a language,   MSDTP, that could be used to define a structured mail protocol.Conclusions:   A.  Existing Mail Services      1.  Mail shall not be sent between hosts if it breaks existing      mail programs.         Outlawed by this rule are:            a. Spaces in user names.            b. Multiple at signs in mailboxes.      2.  Features ofRFC 733 that are generally unimplemented shall      remain unimplemented, and are decommitted from the specification.         Outlawed by this rule are:            a. "Include" and "Postal" type addresses.      3.  Duane Adams will arbitrate disputes.      4.  There shall be no more changes to the MAIL/MLFL FTP reply      codes.   B.  New Mail Services      1.  New services should be provided in the context of the      experimental multimedia mail systems now being planned.Postel                                                          [Page 5]

Summary of Computer Mail Services Meeting                   1 March 1982RFC 808Action Items:   1.  Jon Postel is to circulate a draft specification of a structured   mail protocol by 15-Feb-79.      [* This became IEN-85 published in March 1979 and now superseded      by RFCs 759 and 767. *]   2.  Everyone is to submit a 2 to 3 page position paper on addressing   to Duane Adams by 1-Mar-79.   3.  Everyone is to submit a 2 to 3 page position paper on System   Architecture and Message Transmission by 1-Apr-79.Postel                                                          [Page 6]

Summary of Computer Mail Services Meeting                   1 March 1982RFC 808Appendix A:             First Preliminary List of ARPANET Mail Systems      Center;by Dave Farber   Mail System         Authors          Machines   SNDMSG              Antiquity        Tenex, TOPS-20   READMAIL            Antiquity        TEXEX, TOPS-20   RD                  Larry Roberts    TENEX, TOPS-20   MSG                 Vittal           TENEX (18 SITES)   HERMES              BBN              TENEX (14 SITES)   HG                  Calvin   MAIL                Werme            TOPS-10 on KA and KL10 CMU   RDMAIL              Karlton          TOPS-10 on KA and KL10 CMU   COMSAT              KLH              MIT-MC,-AI,-ML   MAIL/QMAIL (1)      KLH              MIT-MC,-AI,-ML   BABYL               EAK              MIT-MC,-AI,-ML   FTPS (2)            KLH              MIT-MC,-AI,-ML   SIGMA               ISI              Dedicated TENEX   MAILSTAT (3)        BBN              TENEX, TOPS-20   FTP (2)             BBN              TENEX, TOPS-20   MAILER (3)          BBN              TENEX, TOPS-20   MM                  MMcM@AI          SRI-KL   BANANARD            Yonke            TENEX   MSG Version 1       UCB - RAND       PDP 11 UNIX   SNDMSG (UNIX)       UCB - RAND       PDP 11 UNIX   MS                  D. Crocker       PDP 11 UNIX   MSG Version 2       D. Crocker       PDP 11 UNIX   MH                  Borden           RAND-UNIX   Read-mail (1)       Palter & Sibert  Multics all   print-mail          Palter & Sibert  Multics all   send-mail           Palter & Sibert  Multics all   MSGH                Ness at Wharton  Wharton 10   Wharton Mail System Ness at Wharton  Wharton 10   SWAMP               Guyton           IBM 370 Wilber   MSG                 Antiquity        HARVARD and RUTGERS 10   MAIL (1)            Harvey           SU-AI-10   RCV (Mail reader)   Harvey           SU-AI-10   DMSG                (Private)        TENEX   READMAIL                -            LL IBM VM/370   RD                  Haines           LL IBM VM/370   $NETMAIL               ?             AMES-67   (1)  mail sender   (2)  FTP server   (3)  service systemPostel                                                          [Page 7]

Summary of Computer Mail Services Meeting                   1 March 1982RFC 808Attendees:   Name                 Org     Mailbox   Duane Adams          ARPA    Adams@ISIA   Bill Carlson         ARPA    Carlson@ISIA   Vint Cerf            ARPA    Cerf@ISIA   Jerry Burchfiel      BBN     Burchfiel@BBNA   Debbie Deutsch       BBN     DDeutsch@BBNA   Jack Haverty         BBN     Haverty@BBN-Unix   Charles Khuen        BBN     Khuen@BBNC   Mark Lavin           BBN     MLavin@BBNE   Charlotte Mooers     BBN     Mooers@BBNE   Ted Myer             BBN     Myer@BBNA   Ray Nickerson        BBN     Nickerson@BBNC   Paul Santos          BBN     Santos@BBNE   Bob Thomas           BBN     BThomas@BBND   Mike Wingfield       BBN     Wingfield@BBND   Joanne Sattley       CCA     JZS@CCA   Howard Wactlar       CMU     Wactlar@CMU-10A   James Pool           DOE     Pool@BBN   Robert McNab         DCA     DCACode535@ISIA   Ed Cain              DCEC    Cain@EDN-Unix   Warren Hawrylko      DCEC    Lyons@ISIA   Harry Helm           DCEC    Lyons@ISIA   Danny Cohen          ISI     Cohen@ISIB   Jon Postel           ISI     Postel@ISIF   Dave Lebling         MIT     PDL@MIT-XX   Tom Knight           MIT     TK@MIT-AI   R. Stallman          MIT     RMS@MIT-AI   Pat Winston          MIT     PHW@MIT-AI   Al Vezza             MIT     AV@MIT-DMS   Wayne Shiveley       OFDA    ---   Bob Anderson         RAND    Anderson@RAND-Unix   Ken Harrenstien      SRI     KLH@SRI-NIC   Ron Kunzelman        SRI     Kunzelman@SRI-KL   Dave Farber          UDEL    Farber@UDELPostel                                                          [Page 8]