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 368,422 websites that are DKIM Customers. We know of 217,627 live websites using DKIM and an additional 150,795 sites that used DKIM historically and 87,861 websites in the United States.
Get a list of 368,422 websites using DKIM which includes location information, hosting data, contact details, 217,627 currently live websites and an additional 218,273 domains that redirect to sites in this list. 150,795 sites that used this technology previously and 87,861 websites in the United States currently using DKIM.
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