Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1 (RFC7208)
Original Publication Date: 2014-Apr-01
Included in the Prior Art Database: 2014-Apr-26
Internet Society Requests For Comment (RFCs)
The current email infrastructure has the property that any host injecting mail into the system can use any DNS domain name it wants in each of the various identifiers specified by [RFC5321] and [RFC5322]. Although this feature is desirable in some circumstances, it is a major obstacle to reducing Unsolicited Bulk Email (UBE, aka spam). Furthermore, ADMDs (as described in [RFC5598]) are understandably concerned about the ease with which other entities can make use of their domain names, often with malicious intent.
Internet Engineering Task Force (IETF) S. Kitterman Request for Comments: 7208 Kitterman Technical Services Obsoletes: 4408 April 2014 Category: Standards Track ISSN: 2070-1721
Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
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.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7208.
Kitterman Standards Track [Page 1]
RFC 7208 Sender Policy Framework (SPF) April 2014
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