Literally, a name for a name. An alias can be a nickname that identifies a user for e-mail. A user's alias is usually a shortened form of the user's full name, such as the alias JSmith or JeffS for user Jeff Smith.
Aliases are a convenient way of identifying users and form the user-specific portion of an e-mail address. For example, if Jeff Smith belongs to a company whose Domain Name System (DNS) domain on the Internet is northwind.microsoft.com, his e-mail address would be either JSmith@northwind.microsoft.com or, instead, JeffS@ northwind.microsoft.com, depending on which alias is selected.
In Microsoft Exchange Server you can use the auto naming feature in the Exchange Administrator program to generate the alias for a new recipient.