Alias Address and Alternate Address mailbox properties The "Alias Address" and "Alternate Address" mailbox properties are often incorrectly used Alias Address - This field is used by MailSite Express (webmail client) as the Reply-To: address when sending mail. It is not used to set-up an alias for a mailbox. Alternate Address - This field is displayed as a property in the LDAP properties as a different email address for the user. This address is not used for any delivery or forwarding of mail. Server aliases can be configured by clicking on "Server" in the left hand window of the MailSite Windows Console, the double-click on "Aliases" in the right hand window