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RFC 7208 - Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1

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IETF - Internet Engineering Task Force

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RFC 7208: Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1

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https://datatracker.ietf.org/doc/rfc7208/

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IETF Datatracker

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Email on the Internet can be forged in a number of ways. In particular, existing protocols place no restriction on what a sending host can use as the "MAIL FROM" of a message or the domain given on the SMTP HELO/EHLO commands. This document describes version 1 of the Sender Policy Framework (SPF) protocol, whereby ADministrative Management Domains (ADMDs) can explicitly authorize the hosts that are allowed to use their domain names, and a receiving host can check such authorization. This document obsoletes RFC 4408.

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