It's not completely clear in draft-02 whether an additional hierarchy of
subdomains affects anything.
If the rule is "v=spf1 ptr:example.com default=deny" will it be allowed
if the validated PTR of the sending server is "mx1.us.example.com"?
I'm assuming yes.
"Ending" means the matching hostname and the specified domain-name
must share a "."-level boundary. If a hostname is
"qux.my-example.com" and the specified domain-name is "example.com",
there is no match. There is a match if the hostname is
"qux.example.com". There is also a match if the hostname is simply
"example.com".
Perhaps the additional inclusion of "baz.qux.example.com" might be of value?
--
Lee Maguire <lee(_at_)hexkey(_dot_)co(_dot_)uk>
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