Reverse MX

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Reverse MX (RMX) is an email authentication method developed by Hadmut Danisch. It became a basis for the two most commonly used methods - Sender Policy Framework and Sender ID. http://www.danisch.de/work/security/txt/draft-danisch-dns-rr-smtp-04.txt


Development of RMX

Background and motivation

Design criteria

The concept of Reverse MX records

Publication at the IRTF and IETF

Technical description

Implementation as DNS records

Reasons for failure

SPF and Microsoft's attitudes

IRTF/IETF-specific reasons

Design flaws of DNS

Design flaws of the SMTP email protocol

Economical reasons

Freedom of speech and cultural reasons

Education

Perceptions of identity and juristic reasons

Personal and European reasons

References