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 41,396 websites that are Websense Customers. We know of 12,278 live websites using Websense and an additional 29,118 sites that used Websense historically and 4,152 websites in the United States.
Get a list of 41,396 websites using Websense which includes location information, hosting data, contact details, 12,278 currently live websites and an additional 27,585 domains that redirect to sites in this list. 29,118 sites that used this technology previouslyand 4,152 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.