MailChimp is a widely used Mailng List delivery and support service.
http://www.mailchimp.com
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Get access to data on 2,903,509 websites that are MailChimp Customers. We know of 976,147 live websites using MailChimp and an additional 1,927,362 sites that used MailChimp historically and 586,257 websites in the United States.
Get a list of 2,903,509 websites using MailChimp which includes location information, hosting data, contact details, 976,147 currently live websites and an additional 1,056,188 domains that redirect to sites in this list. 1,927,362 sites that used this technology previously and 586,257 websites in the United States currently using MailChimp.