IMail Server is an Internet standards based mail server system for Microsoft Windows NT 4.0 (Service Pack 6) and later, Windows 2000, Windows 2003, and Windows XP Professional. IMail Server consists of a series of programs that run as services on the Windows system, including: Simple Mail Transfer Protocol (SMTP) service for sending and receiving mail over the Internet or in an internal TCP/IP network. Post Office Protocol, version 3 (POP3) service to allow POP3 clients (such as IMail Client and Eudora) to download mail from the IMail Server. Lightweight Directory Access Protocol (LDAP) Version 3 service for publishing user information in an LDAP directory. A List server for creating and managing mailing lists. IMail Server can monitor any of these services, notify you when they are down, and automatically restart a service. Web Messaging lets users access their mail on the IMail Server system from any Web browser on the Internet. It also provides remote management capabilities for IMail administrators. Web Messaging can also display banner ads at the top of the Web Messaging mail screens.