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 1,095,267 websites that are Mandrill Customers. We know of 765,081 live websites using Mandrill and an additional 330,186 sites that used Mandrill historically and 262,341 websites in the United States.
Get a list of 1,095,267 websites using Mandrill which includes location information, hosting data, contact details, 1,506,285 currently live websites which includes 741,204 domains that redirect to sites in the list. 330,186 sites that used this technology previously and 262,341 websites in the United States currently using Mandrill.