From Stalker Software:
The Stalker Internet Mail Server is a server application that implements Internet mail exchange service using the SMTP protocol, remote mailbox access using the POP3 protocol, and remote password modification. The system design allows you to configure, control, and monitor the server from any workstation on your local area network (LAN). The program also offers automatic reply capabilities. In this beta version, many new features have been added. Please be aware that this is a beta version, and that you should back up your files before using this program.