SMTP operational experience in mixed IPv4/IPv6 environements

Document Type Expired Internet-Draft (ngtrans WG)
Authors Motonori Nakamura  , Jun-ichiro Itoh 
Last updated 2015-10-14 (latest revision 2004-01-16)
Stream IETF
Intended RFC status Informational
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired (IESG: Dead)
Consensus Boilerplate Unknown
Telechat date
Responsible AD Bert Wijnen
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document lists operational requirements for IPv6 SMTP and IPv6-capable MX DNS records. As IPv6 SMTP servers are deployed, it has become apparent that certain configurations are necessary in IPv6-capable MX DNS records for stable dual-stack (IPv4 and IPv6) SMTP operation. This document clarifies the problems that exist in the transition period between IPv4 SMTP and IPv6 SMTP. It also defines operational requirements for stable IPv4/v6 SMTP operation.


Motonori Nakamura (
Jun-ichiro Itoh (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)