spf-discuss
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[spf-discuss] Re: Blacklisting Bad SPF Records

2007-03-04 15:56:27
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Frank Ellermann wrote:
Maybe policy validators could determine how many IPs (in percent of
the IPv4 space) are permitted by a policy, and flag anything with
more than 1% as "probably too broad to be really useful".

I have been thinking about such a "specificity" metric in the past, but 
gave up the idea as soon as I started thinking about "exists:" and "ptr:".

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