Mailu - Mailu is a simple yet full-featured mail server as a set of Docker images.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
MailEnable - MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...