What is a Domain?

Domains are sites from which e-mail messages originate. In an e-mail address, everything to the right of the "@" symbol is the domain. Some examples of domains include:

• hotmail.com
• andrew.cmu.edu
• pitt.edu
• aol.com

For example: If you have a domain in your Filter list of "cmu.edu," any e-mail sent from User@cmu.edu would be filtered, but e-mail sent from "User@andrew.cmu.edu" or from "User@spamsender.cmu.edu" would not. The domain must match exactly what is on the right side of the @ sign. This is done to prevent accidental filtering of e-mail that partially matches the domain address.