Barracuda Email Security Gateway - Barracuda's Email Security Gateway is a powerful antivirus filter specifically designed to identify and eliminate email-borne threats, stopping hazards before they reach the network.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...
Scrollout F1 - Scrollout is a free and easy to use anti-spam email gateway designed for Linux & Windows administrators without advanced email security experience.
Cisco Email Security - Cisco Email Security protects against ransomware, business email compromise, spoofing, and phishing.