Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
draft-ietf-spfbis-4408bis-13
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Active Internet-Draft (spfbis WG)
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2013-03-25
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draft-kitterman-4408bis
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IETF
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WG Document
May 2013
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I-D Exists
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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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 26, 2013.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
Kitterman Expires September 26, 2013 [Page 1]
Internet-Draft Sender Policy Framework (SPF) March 2013
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
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material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Kitterman Expires September 26, 2013 [Page 2]
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
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