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 396,524 websites DKIM Customers. We know of 213,386 live websites using DKIM and an additional 183,138 sites that used DKIM historically and 83,567 websites in the United States.
Get a list of 396,524 websites using DKIM which includes location information, hosting data, contact details, 213,386 currently live websites and an additional 209,365 domains that redirect to sites in this list. 183,138 sites that used this technology previouslyand 83,567 websites in the United States currently using DKIM.
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