SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.
Securence - Securence is a managed spam service offering anti-spam and anti-virus filtering technologies.
MailCleaner - Cloud & on-premise anti spam software for businesses
dmarcian - Safeguard your email from abuse
Vade Secure - Email security to protect against email-borne phishing, spear phishing, malware, and ransomware. Email security and management based on artificial intelligence.
Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.