Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
Hornetsecurity - Hornetsecurity offers you comprehensive, integrated managed e-mail security services.
Proxmox Mail Gateway - Protect mail server against spam, viruses and malware with Proxmox Mail Gateway security for businesses, government, education and non-profit organizations.
Happy Moose - Happy Moose is a super-efficient cloud anti-SPAM solution for organizations. It stops up to 99.
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...