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 390,449 websites DKIM Customers. We know of 229,012 live websites using DKIM and an additional 161,437 sites that used DKIM historically and 91,405 websites in the United States.
Get a list of 390,449 websites using DKIM which includes location information, hosting data, contact details, 229,012 currently live websites and an additional 225,714 domains that redirect to sites in this list. 161,437 sites that used this technology previouslyand 91,405 websites in the United States currently using DKIM.
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