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 869,388 websites that are Rackspace Email Hosting Customers. We know of 495,953 live websites using Rackspace Email Hosting and an additional 373,435 sites that used Rackspace Email Hosting historically and 379,021 websites in the United States.
Get a list of 869,388 websites using Rackspace Email Hosting which includes location information, hosting data, contact details, 495,953 currently live websites and an additional 189,638 domains that redirect to sites in this list. 373,435 sites that used this technology previously and 379,021 websites in the United States currently using Rackspace Email Hosting.