If you have checked off the "Show MB Xtra" on the Xtra Parameter screen, you will view the mailbox screen with the Xtra fields.
|Account Number||Enter an account number to group this maibox. System will use default account number shown on the top field and you can override it. Once you add a new account number, it will become the default for the next maibox record unless over-ridden.|
|Box Type||Select Box Type from the drop-down. You can add new Box Types from the Xtra Parameter screen.|