Each Account can have Aliases (alternative names).
If the john_smith Account has the jsmith and j.smith Aliases, E-mail directed to jsmith and to j.smith will be stored in the john_smith Account, and the Signals directed to to jsmith and to j.smith will be delivered to the john_smith Account. To access the john_smith Account via POP, IMAP, XMPP, XIMSS, WebUser, or any other client application both the user names jsmith and j.smith can be specified in the client application settings.
You can modify existing Aliases, you can add an Alias by typing a new name in the empty field, and you can remove an Alias by deleting it from its field. Use the Update button to update the Account Aliases list.
Alias names should not be the same as the name of some other Account, or other Object in the same Domain. The Alias names should meet the Domain Object name restrictions.
You can specify several Aliases in one field by separating them with the comma (,) symbol.