Reverse MX

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Reverse MX ( RMX ) is a proposal for sender authorization for e-mail by Hadmut Danisch from 2002. The aim is to combat spam by making mail spoofing more difficult.

RMX is based on the introduction of a new resource record in the Domain Name System . The RMX record of a domain should contain information about the IP addresses from which e-mails containing this domain in MAIL FROM (see RFC 2821 ) can be sent. If a domain owner configures RMX, the recipient of an e-mail can check whether it was sent from an authorized IP address. This makes it difficult for spammers to falsify sender addresses in order to be able to take better technical and legal action against them.

RMX was one of the first proposals for sender authorization alongside similar approaches such as Designated Senders Protocol (DMP), Caller ID , Sender ID or the further development RMX ++ , which were controversial at the time. In practice, SPF and DomainKeys have prevailed. The ideas of RMX and DMP flowed into SPF, while DomainKeys uses cryptographic mechanisms.

Web links

Individual evidence

  1. openspf.org: Sender Policy Framework History / Pre-SPF . Retrieved September 2, 2012.