The deepOfix Mail Server makes it possible for organizations with minimal technical expertise to have robust server infrastructure. deepOfix offers unprecented ease of use, doesn't require prior GNU/Linux experience and is backed by a full-time development and support team. deepOfix features LDAP-based directory services for user account management, email delivery, distribution lists, and addressbooks. It also includes built in tools for spam and virus control, webmail, and fetching email.
Phuzby will let you search your organisation's LDAP directory (such as Active Diretory, Novell eDirectory, or OpenLDAP) for the contact details of colleagues, customers, or suppliers. Phuzby can display a photo for each person, and can even read the telephone number out loud to help you dial it correctly. In fact, if your phone system supports TDMF tones, you can hold your handset near you PC's speaker and phuzby will dial the number for you.
CD Linux Server is an embedded Linux system on a bootable live CD. It can be used to set up mail, Web, file, FTP, proxy, DHCP, DNS, MySQL, LDAP, and other services very quickly. The mail server includes antivirus, antispam, and mail recorder features. It can be used for free for up to 10 accounts, while the advanced version is licensed for an unlimited number of users. There is not any restriction against the time.