RFC 7505

A "Null MX" No Service Resource Record for Domains That Accept No Mail, June 2015

Canonical URL:
https://www.rfc-editor.org/rfc/rfc7505.txt
File formats:
Plain TextPDF
Status:
PROPOSED STANDARD
Authors:
J. Levine
M. Delany
Stream:
IETF
Source:
appsawg (art)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC7505

Discuss this RFC: Send questions or comments to art@ietf.org

Other actions: Submit Errata  |  Find IPR Disclosures from the IETF


Abstract

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.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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