I have therefore added a ptr:directpceu.com record to the domain, and tested it here: http://www.dnsstuff.com/tools/spf.ch?server=bedstone.org&ip=62.128.191.2 6
This page and the SPF test page both say the email should fail. Even though 62.128.191.26 has a reverse ending in directpceu.com
The catch here is a technicality of SPF, where it won't allow the "ptr:" to pass if the PTR record matches, but has no A record pointing back to the same IP.
So in this case, relay03-1.direcpceu.com does contain "direcpceu.com", but since relay03-1.direcpceu.com does not have an A record, it doesn't pass the test.
-Scott
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