Q. How do I get the bounced back email from mine mail account?

You first select the account which you want to retrieve bounced email from, then choose the "Get Return Email Addresses" option from the "Tools" on the menu bar.

Some other relevent setting regarding bounced email can be adjusted in the "File/Configuration" area within the Mail Communicator. You can set whether to add the bounced the email to a list and remove them from the list or not.