MDaemon Messaging Server, email server software, is a trusted alternative to Microsoft Exchange or SBS. MDaemon supports IMAP, SMTP, POP3, and ActiveSync protocols and delivers solid performance from its feature-rich and user-friendly design.
AA Mail Server, from www.aamailsoft.com, is mail server sofware with dedicated database based on Windows mail server. It helps small and medium-sized companies (1~20000 accounts) to build their own webmail server and mail system easily.
MDaemon FREE mail server software is a free 5-user license Windows-based mail server. Available in multiple languages and supports SMTP and POP3 protocols. Features remote administration and a powerful webmail client.
Merak Mail Server Software – supporting unlimited users, POP3, SMTP, IMAP4, HTTP protocols, mail server based virus scanning, spam filtering, and web mail accounts.