Greg Hewgill (ghewgill) wrote,
Greg Hewgill

spf -all

A recent post by taral piqued my curiosity and made me wonder just how many domains publish "-all" (hardfail) in their SPF records. To that end, I have set up which aims to count them.

I am currently loading domains into the database. This involves a DNS lookup for each domain name, so it's only going at an average rate of a few per second. I have several million domain names ready to be loaded, so I expect the initial load to take a few weeks. I have grabbed domain names from the following sources so far:

If you can think of any other easily obtainable list of domain names, let me know!

And for what it's worth, the highest-alexa-ranked domain that publishes SPF -all is ...drumroll...

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