1)   MDaemon 9.6.5
MDaemon, Windows-based email server software, contains full mail server functionality and control with a strong emphasis on security to protect your email communication needs. Security features include Greylisting, DKIM, DomainKeys, SPF, Sender ID.

 2)   RelayFax Server 6.7.6
RelayFax is a powerful email-to-fax and fax-to-email fax server. RelayFax Pro automates the process of sending, receiving and managing your network fax traffic. By integrating into existing email systems, RelayFax provides full faxing capabillities.

 3)   AA Mail Server Software 2.21
<a href="http://www.aamailsoft.com/">AA Mail Server Software</a> is powerful enterprise level email server software, supports 10~20000+ users with each 2G+ mailbox, includes SMTP/POP3, anti-spam, email monitoring, UTF-8 Webmail, SQL-support etc.