Inbound email scrutiny and data loss prevention services.
http://www.websense.com/content/email-security-overview.aspx
Email Hosting Providers · Secure Email
Get access to data on 41,563 websites that are Websense Customers. We know of 12,383 live websites using Websense and an additional 29,180 sites that used Websense historically and 4,180 websites in the United States.
Get a list of 41,563 websites using Websense which includes location information, hosting data, contact details, 12,383 currently live websites and an additional 27,778 domains that redirect to sites in this list. 29,180 sites that used this technology previouslyand 4,180 websites in the United States currently using Websense.
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These are sites that we think might use Websense in the future because of their similarity to other sites that already do.