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Unrolling SPF records to find out which networks are in there, including mx & includes is fun.

And scary sometimes, just look at the one from salesforce.com:
gist.github.com/keltia/df0b881

WIP at github.com/keltia/spf

@feld this is not a general tool, it is to match the addresses in a specific SPF RR with the list of currently allowed addresses. Right now, if I naively use just *2* include:, I get more than 16 DNS lookups and SPF only allow 10…

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