User's E-Mail Address

Users->AddUser->EMailAddress

This field allows you to specify an e-mail name for a user, that is different from the name of their mail box. For example, the user John Smith might have the mailbox johns but the E-Mail Address John.Smith. The user can actually receive e-mail under either of these names, but it is generally considered good practice to keep them different so that a person outside the company can know a user's e-mail address without knowing their main box name. This helps keep the mail box more secure.

Allowable characters are 0-9, a-z, A-Z, ".", "-" and "_"