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 613,979 websites that are Sender ID Customers. We know of 437,566 live websites using Sender ID and an additional 176,413 sites that used Sender ID historically and 98,017 websites in the United States.
Get a list of 613,979 websites using Sender ID which includes location information, hosting data, contact details, 437,566 currently live websites and an additional 382,809 domains that redirect to sites in this list. 176,413 sites that used this technology previously and 98,017 websites in the United States currently using Sender ID.
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