RFC 1465 (rfc1465) - Page 2 of 31

Routing Coordination for X

RFC 1465        Routing Coordination for X.400 Services         May 1993


   but may also be used at a national level or even within an
   organisation.

   Many experts from IETF X.400-Operations Group and RARE Working Group
   1 on Message Handling Systems have read drafts of this document and
   contributed ideas and solutions.  I would especially like to thank
   Harald Alvestrand, Erik Huizer, Marko Kaittola, Allan Cargille and
   Paul-Andre Pays.

   This is the third version of a table format.  The first one was in
   use within COSINE-MHS for about two years.  A second version with
   major enhancements was then proposed which has been in use for the
   past year.  The third version will probably be the last one before it
   will be possible to switch to dynamic, directory service based
   routing.

2. Terminology

   MHS community

      One or more MHS domains form an MHS community.  Mail exchange
      between these MHS domains is defined by the coordination
      procedures within this document.  Examples of such communities are
      the Global Open MHS service GO-MHS and the COSINE-MHS service.

   MHS domain

      One or more MHS subtrees form an MHS domain.  This is a purely
      administrative grouping of MHS subtrees.  It is helpful, if
      someone is responsible for several MHS subtrees, to refer to an
      MHS domain instead of listing all the subtrees.

   MHS subtree

      An MHS subtree consists of the total of the mailboxes addressable
      within a subtree of the X.400 OR address space.

        Example:  O=SWITCH; P=SWITCH; A=ARCOM; C=CH;

        MHS domain of SWITCH in Switzerland, consisting of all
        mailboxes with O=SWITCH; P=SWITCH; A=ARCOM; C=CH; in the OR
        address.

   RELAY-MTA

      An X.400 MTA serving one or several MHS domains.  Note that the
      term WEP -Well Known Entry Point- has been used since the early
      X.400ies (1987/88) until now, giving the wrong impression of a



Eppenberger