DNS Resource Record Types. This document describes version 1 ofThe Sender Policy Framework (SPF) protocol, whereby a domain mayExplicitly authorize the hosts that are allowed to use its domainName, and a receiving host may check such authorization.1. InParticular, existing protocols place no restriction on what a sendingHost can use as the reverse-path of a message or the domain given onThe SMTP HELO/EHLO commands. It wouldBe inappropriate to advance Sender-ID on the standards track withoutThe community is invited to observe the success or failure of the twoApproaches during the two years following publication, in order thatA community consensus can be reached in the future.E-mail on the Internet can be forged in a number of ways. Depending on the actions associated by the recipientWith those heuristics, the message may not be delivered or may beParticipants relying on Sender ID experiment DNS records are warnedThat they may lose valid messages in this set of circumstances.AParticipants publishing SPF experiment DNS records should considerThe advice given in section 3.4 of RFC 4406 and may wish to publishBoth v=spf1 and spf2.0 records to avoid the conflict.RFC 4408 Sender Policy Framework (SPF) April 2006Participants in the Sender-ID experiment need to be aware that theWay Resent-* header fields are used will result in failure to receiveLegitimate email when interacting with standards-compliant systems(specifically automatic forwarders which comply with the standards byNot adding Resent-* headers, and systems which comply with RFC 822But have not yet implemented RFC 2822 Resent-* semantics). Depending on the content of the record,This may mean that Sender-ID heuristics would be applied incorrectlyTo a message.
SPF-Authorized E-Mail May Contain Other FalseIdentities. Forwarding Services and Aliases. The Received-SPF Header Field. Redirect: Redirected Query. The check_host() Function.
46The current E-Mail infrastructure has the property that any hostInjecting mail into the mail system can identify itself as any domainName it wants. Multiple Requirements Example. The Received-SPF Mail Header Field. Contributors and Acknowledgements.
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