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 509,686 websites that are DKIM Customers. We know of 282,497 live websites using DKIM and an additional 227,189 sites that used DKIM historically and 120,459 websites in the United States.
Get a list of 509,686 websites using DKIM which includes location information, hosting data, contact details, 282,497 currently live websites and an additional 253,342 domains that redirect to sites in this list. 227,189 sites that used this technology previouslyand 120,459 websites in the United States currently using DKIM.
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