Mandrill is an email infrastructure service. Detailed analytics offer insight to measure email performance.
http://mandrill.com/
Email Hosting Providers · Transactional Email
Get access to data on 1,109,680 websites that are Mandrill Customers. We know of 758,042 live websites using Mandrill and an additional 351,638 sites that used Mandrill historically and 257,719 websites in the United States.
Get a list of 1,109,680 websites using Mandrill which includes location information, hosting data, contact details, 758,042 currently live websites and an additional 738,150 domains that redirect to sites in this list. 351,638 sites that used this technology previously and 257,719 websites in the United States currently using Mandrill.