Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.
Cdw - cdw: ncurses interface for GNU/Linux command line CD/DVD tools
Mimecast Gateway - Mimecast Gateway is a SaaS-based email security solution that uses sophisticated, multi-layered detection engines and intelligence to protect email data and employees from malware, spam, advanced threats and zero-day attacks.
CompuCom - Technology Solutions for the Digital Workplace
dmarcian - Safeguard your email from abuse
Sirius - An open-source clone of Siri from UMICH