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 1,047,663 websites that are Mandrill Customers. We know of 280,854 live websites using Mandrill and an additional 766,809 sites that used Mandrill historically and 112,015 websites in the United States.
Get a list of 1,047,663 websites using Mandrill which includes location information, hosting data, contact details, 588,978 currently live websites which includes 308,124 domains that redirect to sites in the list. 766,809 sites that used this technology previously and 112,015 websites in the United States currently using Mandrill.