If provided, then Shipping Manager will validate whether an e-mail-address has a valid structure while creating an order/printing a label.

Should this not be the case, then the generation will stop and an error message will be shown :"Errors encountered during the validation of your order"".

In the main screen, one or multiple contact e-mail fields will have a red border.

In this case, please correct the e-mail-address, paying extra attention, not to have any preceding or trailing spaces, as this is a known cause for the validation to fail.