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A NULL MX Resource Record means "I never accept email"
draft-delany-nullmx-00

The information below is for an old version of the document.
Document Type
This is an older version of an Internet-Draft whose latest revision state is "Replaced".
Expired & archived
Author Mark Delany
Last updated 2005-04-06
Replaced by draft-ietf-appsawg-nullmx, draft-ietf-appsawg-nullmx, RFC 7505
RFC stream (None)
Formats
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:

Abstract

A common strategy of SMTP servers when deciding whether to accept an email or not, is to ensure that the 2821.MailFrom contains a domain willing to accept non-delivery email (aka bounces). When the 2821.MailFrom domain has a DNS MX Resource Record (RR), it is making an explicit statement that it is willing to accept email. However, when the domain has just a DNS A (or AAAA) RR, there is no such clarity as most hosts on the Internet advertise an A RR regardless of whether they want to accept email or not. The NULL MX RR formalizes the existing mechanism by which a domain communicates that it will never accept email.

Authors

Mark Delany

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