A user has 3 email addresses configured on his Exchange 2007 mailbox. For certain email that he sends, he would like to have it appear to the recipient that the email came from an address other than his primary. The "From" button has been added to his Outlook message window. The "From" pull-down displays "other e-mail addresses". When you select other email addresses, a dialog appears to browse the GAL. If you type in the alternate email address, it populates the "From" field with the primary email address.
How do I configure Outlook or Exchange to enable the user to choose the email address that will appear to the recipient?