Version 2.0.8 - May 25, 2013
  * Use ipaddr/ipaddres module in place of custom IP processing code
  * Numerous python3 compatibility fixes
  * Improved unicode error detection in SPF records
  * Fixed a bug caused by a null CNAME in cache

Version 2.0.7 - January 19, 2012
  * Allow for timeouts to be global for all DNS lookups instead of per DNS lookup
    to allow for MAY processing time limitsin RFC 4408 10.1.  See README for
    details.
  * Use openspf.net for SPF web site instead of openspf.org
  * Extend query.get_header to return either Received-SPF (still default) or
    RFC 5451 Authentication Results headers (needs authres 0.3 or later)
  * Rework query.parse_header:
    - Make query.parse_header automatically select Received-DPF or
      Authentication Results header types and use them to collect SPF
      results from trusted relays
    - Add query.parse_header_spf and query.parse_header_ar functions for
      header type specific processing
  * Finish Python3 port - works with python2.6/2.7/3.2 and 2to3 is no longer
    required - will also work with newer py3dns where TXT records are returned
    as type bytes and not strings
  * Accounts for new py3dns error classes coming in py3dns 3.0.2 (but fully
    backward compatible with earlier versions)
  * check for 7-bit ascii on TXT and SPF records
  * fix CNAME chain duplicating TXT records

Version 2.0.6 - October 27, 2011
  * Refactor code so that 2to3 will provide a working python3 module - Now
    requires at least python2.6
  * Update spfquery.py, type99.py, and testspf.py to work with either python or
    python3 (2to3 not needed for these scripts)
    - SPF test suite can now be run from either python or python3
  * Ensure Temperror for all DNS rcodes other than 0 and 3 per RFC 4408
  * Parse Received-SPF header
  * Report CIDR error only for valid mechanism
  * Handle invalid SPF record on command line
  * Add timeout to check2

Version 2.0.5 - July 29, 2008
  * Add TCP fallback if DNS UDP reply is truncated
    - Fixes inconsistent results from trying to use partial UDP replies
  * Correct Received-SPF formatting
  * Minor updates to reflect RFC 4408 errata
  * Added License file for RFC 4408 test suite
  * Update RFC 4408 test suite from svn
  * Fix Type99 conversion script to work with multi-string TXT records
  * Timeout parameter

Version 2.0.4 - January 24, 2007
  * Correct unofficial 'best guess' processing.
  * PTR validation processing cleanup
  * Improved detection of exp= errors
  * Keyword parameters on get_header()

Version 2.0.3 - January 15, 2007
  * IPv6 compatibility test fix to support Python 2.2
  * Change DNS queries to only check Type SPF in Harsh mode
  * pyspf requires pydns, python-pyspf requires python-pydns
  * Record matching mechanism and add to Received-SPF header.
  * Test for RFC4408 6.2/4, and fix spf.py to comply.
  * Permerror for more than one exp or redirect modifier.
  * Parse op= modifier

Version 2.0.2 - January 4, 2007
  * Update openspf URLs
  * Update Readme to better describe available pyspf interfaces
  * Add basic description of type99.py and spfquery.py scripts
  * Add usage instructions for type99.py DNS RR type conversion script
  * Add spfquery.py usage instructions
  * Incorporate downstream feedback from Debian packager
  * Fix key-value quoting in get_header

Version 2.0.1 - December 08, 2006 
  * Prevent cache poisoning attack
  * Prevent malformed RR attack
  * Update license on a few files we missed last time

Version 2.0 - November 20, 2006
  * Completed RFC 4408 compliance
  * Added spf.check2 for RFC 4408 compatible result codes
  * Full IP6 support
  * Fedora Core compatible RPM spec file
  * Update README, licenses

Version 1.8 - July 26, 2006
  * YAML test suite syntax
  * trailing dot support (RFC4408 8.1)

Version 1.7 - July 21, 2005
  * Strict processing limits per newly official SPF RFC
  * Fixed several parsing bugs under RFC 
  * Support official IANA SPF record (type99)
  * Extended SPF processing results beyond strict RFC limits
  * Validate spf.py against test suite, and add Received-SPF support to spf.py
  * Support best_guess for SPF
  * Support SPF delegation

Version 1.6 - December 18, 2003
  * Arik Baratz pointed out endian problems using socket.inet_ntoa() and
    socket.inet_aton().  Use struct.pack("!L", struct.unpack("!L") to fix.

Version 1.5 - December 17, 2003
  * Replace DNS.addr2bin() and DNS.bin2addr() with socket.inet_ntoa() and
    socket.inet_aton().  New code supports n, n.n, and n.n.n formats for IPv4
    addresses, and gets rid of annoying Python 2.4 future warnings

Version 1.4 - December 16, 2003
  * Greg Connor discovered that SPF queries to altavista.com were broken. 
    This was testing to see if a mechanism needs to be macro expanded _before_
    leading ? + - characters were removed.
  * Fixed include handling to be a real mechanism: -include must work.

Version 1.3.1 - December 14, 2003
  * Forgot to include new test file in distribution.
  * Forgot CHANGELOG in distribution.

Version 1.3 - December 13, 2003
  * Add %{o} (original sender domain) macro
  * The ./spf.py {spf} {ipaddr} {sender} {helo} command line didn't print
    out the results.  Oops.
  * Support default= so Meng's test #6 'v=spf1 default=deny' works
  * Any IP address '127.*.*.*' automatically pass, so all Meng's tests work
  * Follow DNS CNAMES
  * Cache DNS results, including additional info, reducing DNS query load
  * Support Python 2.2 (doesn't have bool, True, False: those are
    added in Python 2.2.1)

Version 1.2 - December 11, 2003
  * Added exp= (explanation) and redirect= modifiers
  * Added macros

Version 1.1 - December 9, 2003
  * Meng Weng Wong added PTR code, THANK YOU

Version 1.0 - December 9, 2003
  * Initial Version