Magic Winmail is an enterprise class mail server software system offering a robust feature set, including extensive security measures. Winmail Server supports SMTP, POP3, IMAP, Webmail, LDAP, multiple domains, SMTP authentication, spam protection, anti-virus protection, SSL/TLS security, Network Storage, remote access, Web-based administration, and a wide array of standard email options such as filtering, signatures, real-time monitoring, archiving, and public email folders.

You can avail of the server package that best fits your needs. You can choose from licences for:

12 users
25 users
50 users
100 users
250 users
500 users
1000 users
unlimited users

You can find out more by visiting their website