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 1,169,289 websites that are Mandrill Customers. We know of 751,969 live websites using Mandrill and an additional 417,320 sites that used Mandrill historically and 252,892 websites in the United States.
Get a list of 1,169,289 websites using Mandrill which includes location information, hosting data, contact details, 751,969 currently live websites and an additional 744,898 domains that redirect to sites in this list. 417,320 sites that used this technology previously and 252,892 websites in the United States currently using Mandrill.