Email Hosting products that are built for Business.
http://www.rackspace.com/apps/email_hosting/
Email Hosting Providers · Business Email Hosting · Web Hosting Provider Email
Get access to data on 851,569 websites that are Rackspace Email Hosting Customers. We know of 163,497 live websites using Rackspace Email Hosting and an additional 688,072 sites that used Rackspace Email Hosting historically and 133,351 websites in the United States.
Get a list of 851,569 websites using Rackspace Email Hosting which includes location information, hosting data, contact details, 163,497 currently live websites and an additional 133,510 domains that redirect to sites in this list. 688,072 sites that used this technology previously and 133,351 websites in the United States currently using Rackspace Email Hosting.