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 42,340 websites that are Websense Customers. We know of 17,350 live websites using Websense and an additional 24,990 sites that used Websense historically and 5,543 websites in the United States.
Get a list of 42,340 websites using Websense which includes location information, hosting data, contact details, 17,350 currently live websites and an additional 35,730 domains that redirect to sites in this list. 24,990 sites that used this technology previously and 5,543 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.