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 560,714 websites that are DKIM Customers. We know of 300,469 live websites using DKIM and an additional 260,245 sites that used DKIM historically and 128,259 websites in the United States
This is an excluded technology from charts. A general function of email not related to a technology product.
9,426 live sites
7,258,112 live sites
5,848 live sites
16,640 live sites
1,019 live sites
375 live sites
8,112 live sites
22,546 live sites
140,052 live sites
16,543 live sites
134,830 live sites
11,325 live sites
4,749 live sites
162,940 live sites
178,052 live sites
1,109 live sites
18,931,821 live sites
68,212 live sites
599 live sites
16,148,971 live sites
50,480 live sites
0 live sites
1,251 live sites
26,974 live sites
23,129,638 live sites
23,415 live sites
431,479 live sites
4,489 live sites
503 live sites
73,076 live sites
Get a list of 358,367 websites using DKIM which includes location information, hosting data and contact details. The list includes 300,469 live websites and 57,898 websites redirecting to those sites. 128,259 of these sites are in the United States.
We also know of 260,245 sites that have used DKIM previously.