Email and web security services, providing Microsoft 365, secure exchange hosting and spam/virus protection.
https://www.appriver.com/
Email Hosting Providers · Secure Email
Get access to data on 142,490 websites that are AppRiver Customers. We know of 74,071 live websites using AppRiver and an additional 68,419 sites that used AppRiver historically and 62,424 websites in the United States.
Get a list of 142,490 websites using AppRiver which includes location information, hosting data, contact details, 74,071 currently live websites and an additional 83,599 domains that redirect to sites in this list. 68,419 sites that used this technology previouslyand 62,424 websites in the United States currently using AppRiver.
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These are sites that we think might use AppRiver in the future because of their similarity to other sites that already do.