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 1,140,162 websites that are Mandrill Customers. We know of 756,732 live websites using Mandrill and an additional 383,430 sites that used Mandrill historically and 252,839 websites in the United States.
Get a list of 1,140,162 websites using Mandrill which includes location information, hosting data, contact details, 756,732 currently live websites and an additional 753,130 domains that redirect to sites in this list. 383,430 sites that used this technology previously and 252,839 websites in the United States currently using Mandrill.