A new Request for Comments is now available in online RFC libraries.


        RFC 1664:

        Title:      Using the Internet DNS to Distribute
                    RFC1327 Mail Address Mapping Tables
        Author:     C. Allocchio, A. Bonito, B. Cole, S. Giordano & 
                    R. Hagens 
        Mailbox:    Claudio.Allocchio@elettra.trieste.it,
                    bonito@cnuce.cnr.it, bcole@cisco.com,
                    giordano@cscs.ch, hagens@ans.net 
        Pages:      23
        Characters: 50,783
        Updates/Obsoletes:  none


This memo defines how to store in the Internet Domain Name System the
mapping information needed by e-mail gateways and other tools to map
RFC822 domain names into X.400 O/R names and vice versa.  Mapping
information can be managed in a distributed rather than a centralised
way.  Gateways located on Internet hosts can retrieve the mapping
information querying the DNS instead of having fixed tables which need
to be centrally updated and distributed.  This memo is a joint effort
of X.400 Operations Working Group (x400ops) of the IETF and the RARE
Mail and Messaging Working Group (WG-MSG).

This memo defines an Experimental Protocol for the Internet community.
This memo does not specify an Internet standard of any kind.
Distribution of this memo is unlimited.

This announcement is sent to the IETF list and the RFC-DIST list.
Requests to be added to or deleted from the IETF distribution list
should be sent to IETF-REQUEST@CNRI.RESTON.VA.US.  Requests to be
added to or deleted from the RFC-DIST distribution list should
be sent to RFC-REQUEST@NIC.DDN.MIL.

Details on obtaining RFCs via FTP or EMAIL may be obtained by sending
an EMAIL message to rfc-info@ISI.EDU with the message body 
help: ways_to_get_rfcs.  For example:

        To: rfc-info@ISI.EDU
        Subject: getting rfcs

        help: ways_to_get_rfcs

Requests for special distribution should be addressed to either the
author of the RFC in question, or to admin@DS.INTERNIC.NET.  Unless
specifically noted otherwise on the RFC itself, all RFCs are for
unlimited distribution.

Submissions for Requests for Comments should be sent to
RFC-EDITOR@ISI.EDU.  Please consult RFC 1543, Instructions to RFC
Authors, for further information.


Joyce K. Reynolds
USC/Information Sciences Institute