Sender ID is an anti-spoofing email framework heavily based on SPF.
https://en.wikipedia.org/wiki/Sender_ID
Email Hosting Providers
Get access to data on 599,804 websites that are Sender ID Customers. We know of 458,836 live websites using Sender ID and an additional 140,968 sites that used Sender ID historically and 123,272 websites in the United States.
Get a list of 599,804 websites using Sender ID which includes location information, hosting data, contact details, 458,836 currently live websites and an additional 464,356 domains that redirect to sites in this list. 140,968 sites that used this technology previously and 123,272 websites in the United States currently using Sender ID.
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