RFC 1090 (rfc1090) - Page 3 of 4

SMTP on X

RFC 1090                      SMTP on X.25                 February 1989


         seconds, the call should be cleared and retried later.

      10.2. established

         After the protocol session is established, the circuit should
         be cleared if no response is received for 10 minutes.

      10.3. closing

         After the QUIT command is issued, the timeout should be
         shortened to 20 seconds.  This will sometimes cause an
         ungraceful exit, but this will not affect the SMTP transactions
         already completed.

      10.4. clearing

         When the X.25 Clear Request packet has been sent, the VC should
         be timed out in accordance with the X.25 protocol
         specification.

      11. Other features

         Other features of X.25, such as permanent virtual circuits and
         D bit selection, are not used.

References

     [1]  Postel, J., "Simple Mail Transfer Protocol", RFC 821, USC
          Information Sciences Institute, August 1982.

     [2]  CCITT Recommendation X.25, "Interface Between Data
          Terminal Equipment (DTE) and Data Circuit-Terminating
          Equipment (DCE) for Terminals Operating in the Packet
          Mode and Connected to Public Data Networks by Dedicated
          Circuit", International Telegraph and Telephone Consultative
          Committee, Fascicle VIII.3, Geneva, 1976; amended at
          Geneva, 1980 and Malaga-Torremolinos, 1984. ("Red Book")

Author's Address

   Robert Ullmann 23A-32
   Prime Computer, Inc.
   Technology Drive
   Milford, MA 01757

   Phone: +1 508 478 8600 x1736

   Email: 



Ullmann