A "Null MX" No Service Resource Record for Domains That Accept No Mail (RFC7505)
Original Publication Date: 2015-Jun-01
Included in the Prior Art Database: 2015-Jul-01
Internet Society Requests For Comment (RFCs)
J. Levine: AUTHOR [+2]
This document defines the No Service MX, informally called "null MX", as a simple mechanism by which a domain can indicate that it does not accept email.
Internet Engineering Task Force (IETF) J. Levine Request for Comments: 7505 Taughannock Networks Category: Standards Track M. Delany ISSN: 2070-1721 Apple Inc. June 2015
A "Null MX" No Service Resource Record for Domains That Accept No Mail
Internet mail determines the address of a receiving server through the DNS, first by looking for an MX record and then by looking for an A/AAAA record as a fallback. Unfortunately, this means that the A/AAAA record is taken to be mail server address even when that address does not accept mail. The No Service MX RR, informally called "null MX", formalizes the existing mechanism by which a domain announces that it accepts no mail, without having to provide a mail server; this permits significant operational efficiencies.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7505.
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Delany Standards Track [Page 1]
RFC 7505 Null MX June 2015
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Conventions Used in This Document . . . . . . . . . . . . . . 2 3. MX Resource Records Specifying...