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 42,010 websites Websense Customers. We know of 16,811 live websites using Websense and an additional 25,199 sites that used Websense historically and 5,452 websites in the United States.
Get a list of 42,010 websites using Websense which includes location information, hosting data, contact details, 16,811 currently live websites and an additional 31,779 domains that redirect to sites in this list. 25,199 sites that used this technology previouslyand 5,452 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.