DomainKeys Identified Mail provides a method for validating a domain name identity that is associated with a message through cryptographic authentication.
https://www.dkim.org/
Email Hosting Providers
Get access to data on 516,392 websites that are DKIM Customers. We know of 290,705 live websites using DKIM and an additional 225,687 sites that used DKIM historically and 122,821 websites in the United States.
Get a list of 516,392 websites using DKIM which includes location information, hosting data, contact details, 290,705 currently live websites and an additional 259,563 domains that redirect to sites in this list. 225,687 sites that used this technology previouslyand 122,821 websites in the United States currently using DKIM.
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