Care was taken to avoid incompatibility issues in RFC 7208.

Changes in Implementation Requirements from RFC 4408 are given in:
http://tools.ietf.org/html/rfc7208#appendix-B

I only quote the first bullet:

   o  Use of DNS RR type SPF (99) has been removed from the protocol;
      see [RFC6686] for background.

I think it is straightforward and beneficial to implement it in
Courier, as it will reduce the number of lookups and eliminate a few
quirks.  Note that type 99 is still legit, but it is not supported by
the revised SPF protocol.

Scott is upgrading the test-suite.  Checking the behavior against the
revised suite may bring further suggestions for code changes, in the
future.

Ale

-------- Original Message --------
From: rfc-edi...@rfc-editor.org
Date: Fri, 25 Apr 2014 15:02:06 -0700 (PDT)
To: ietf-annou...@ietf.org, rfc-d...@rfc-editor.org
Cc: spfbis, drafts-update-...@iana.org, rfc-edi...@rfc-editor.org
Subject: [spfbis] RFC 7208 on Sender Policy Framework (SPF) for Authorizing Use 
of Domains in Email, Version 1 

A new Request for Comments is now available in online RFC libraries.

        
        RFC 7208

        Title:      Sender Policy Framework (SPF) for 
                    Authorizing Use of Domains in Email, 
                    Version 1 
        Author:     S. Kitterman
        Status:     Standards Track
        Stream:     IETF
        Date:       April 2014
        Mailbox:    sc...@kitterman.com
        Pages:      64
        Characters: 144189
        Obsoletes:  RFC 4408

        I-D Tag:    draft-ietf-spfbis-4408bis-21.txt

        URL:        http://www.rfc-editor.org/rfc/rfc7208.txt

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.

This document is a product of the SPF Update Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Internet
Official Protocol Standards (STD 1) for the standardization state and
status of this protocol.  Distribution of this memo is unlimited.

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