Trustwave Secure Email Gateway - Trustwave Secure Email Gateway helps protect your email environment against modern threats such as malware, ransomware and phishing, and helps prevent loss of sensitive corporate data.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Mimecast Secure Email Gateway - Prevent targeted email-borne attacks with Mimecast Secure Email Gateway for cloud-based anti-virus and anti-spam protection.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
Appriver - AppRiver is an email and web security company, develops SaaS-based anti-spam, hosted exchange, email encryption and web protection solutions.
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...