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 501,558 websites that are DKIM Customers. We know of 256,156 live websites using DKIM and an additional 245,402 sites that used DKIM historically and 109,885 websites in the United States.
Get a list of 501,558 websites using DKIM which includes location information, hosting data, contact details, 256,156 currently live websites and an additional 249,716 domains that redirect to sites in this list. 245,402 sites that used this technology previouslyand 109,885 websites in the United States currently using DKIM.
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