Reverse MX/Bibliography

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A list of key readings about Reverse MX.
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Reverse MX drafts

RMX was developed and published as drafts with the Title "A DNS RR for simple SMTP sender authentication" at the IETF. IETF drafts expire after 6 months and can, once expired, be deleted at any time. Although the IETF published all similar and related proposals derived from RMX as permanent RFCs for historical reasons, the IETF refused to accept RMX itself as an RFC for unknown reasons (thus breaking its own citation rules since the derived permanent RFCs cite the non-permanent RMX draft).

Although DNS can be updated dynamically, the RMX records are of static nature, and the owner of the DNS domain usually does not get knowledge of the queries, which could reveal abuse of a domain name by a third party. Therefore an extension to RMX was drafted that substitutes the DNS record with a HTTP query, allowing the domain owner to use any arbitrary algorithm to authorize use of a domain name for any purpose, and to register where it has been used:

Derived and related proposals

These RFCs have been published by the IETF for historical reasons in April 2006:

  • RFC 4405: SMTP Service Extension for Indicating the Responsible Submitter of an E-Mail Message
  • RFC 4406: Sender ID: Authenticating E-Mail
  • RFC 4407: Purported Responsible Address in E-Mail Messages
  • RFC 4408: Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1