Winmail Mail Server (500 users)

a professional grade Internet mail server designed for small businesses and great for large multi-branched corporations. Winmail provides support for SMTP, POP3, IMAP, LDAP, WebMail, anti-virus, multiple domains, SMTP authentication, remote administrative control, spam filtering, mailbox quotas, mail groups, mail routing, mailbox monitor features. Support for popular mail client software like Outlook Express, Outlook, Netscape, Eudor