Exchange supports SMTP, HTTP, and NNTP Internet protocols, as well as Internet Message Access Protocol version 4 (IMAP4) and Post Office Protocol version 3 (POP3). Each protocol has an associated virtual server with a defined set of IP addresses and configuration properties. By setting the configuration properties, you can protect your mail system in the following ways:
In addition, the Internet protocols (SMTP, HTTP, and NNTP) enable you to use logging to track the commands the virtual server receives from clients. When used with Windows 2000 event logs, the protocol log enables you to audit the use of the virtual server and identify problems.
The SMTP and NNTP protocols further enable you to restrict message size and limit the number of recipients a message can reach.
Related TopicsSet User Authentication on Virtual Servers Control Connections to Virtual Servers Enable Logging for SMTP, NNTP, and HTTP Protocols Set Message Size Limits for SMTP Virtual Servers Set Posting Limits for NNTP Virtual Servers Configure an NNTP Virtual Server