Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
draft-ietf-spfbis-4408bis-13
Network Working Group S. Kitterman
Internet-Draft Kitterman Technical Services
Obsoletes: 4408 (if approved) March 25, 2013
Intended status: Standards Track
Expires: September 26, 2013
Sender Policy Framework (SPF) for Authorizing Use of Domains in Email,
Version 1
draft-ietf-spfbis-4408bis-13.txt
Abstract
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 an ADMD can
explicitly authorize the hosts that are allowed to use its domain
names, and a receiving host can check such authorization.
This document obsoletes RFC4408.
Status of this Memo
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This Internet-Draft will expire on September 26, 2013.
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Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
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Internet-Draft Sender Policy Framework (SPF) March 2013
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Internet-Draft Sender Policy Framework (SPF) March 2013
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 6
1.1.1. Keywords . . . . . . . . . . . . . . . . . . . . . . . 6
1.1.2. Imported Definitions . . . . . . . . . . . . . . . . . 6
1.1.3. MAIL FROM Definition . . . . . . . . . . . . . . . . . 7
1.1.4. HELO Definition . . . . . . . . . . . . . . . . . . . 7
1.2. check_host() . . . . . . . . . . . . . . . . . . . . . . . 7
2. Operational Overview . . . . . . . . . . . . . . . . . . . . . 8
2.1. The "HELO" Identity . . . . . . . . . . . . . . . . . . . 8
2.2. The "MAIL FROM" Identity . . . . . . . . . . . . . . . . . 8
2.3. Publishing Authorization . . . . . . . . . . . . . . . . . 8
2.4. Checking Authorization . . . . . . . . . . . . . . . . . . 9
2.5. Location of Checks . . . . . . . . . . . . . . . . . . . . 10
2.6. Results of Evaluation . . . . . . . . . . . . . . . . . . 10
2.6.1. None . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.2. Neutral . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.3. Pass . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.4. Fail . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.5. Softfail . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.6. Temperror . . . . . . . . . . . . . . . . . . . . . . 11
2.6.7. Permerror . . . . . . . . . . . . . . . . . . . . . . 11
3. SPF Records . . . . . . . . . . . . . . . . . . . . . . . . . 12
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