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 1,052,588 websites that are Mandrill Customers. We know of 754,229 live websites using Mandrill and an additional 298,359 sites that used Mandrill historically and 253,121 websites in the United States.
Get a list of 1,052,588 websites using Mandrill which includes location information, hosting data, contact details, 754,229 currently live websites and an additional 1,007,714 domains that redirect to sites in this list. 298,359 sites that used this technology previously and 253,121 websites in the United States currently using Mandrill.