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 41,837 websites Websense Customers. We know of 15,292 live websites using Websense and an additional 26,545 sites that used Websense historically and 5,101 websites in the United States.
Get a list of 41,837 websites using Websense which includes location information, hosting data, contact details, 15,292 currently live websites and an additional 32,207 domains that redirect to sites in this list. 26,545 sites that used this technology previouslyand 5,101 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.