Will customs accept form BSF673 via e-mail or do we need to do personal presentation?

Will customs accept form BSF673 via e-mail or do we need to do personal presentation?

Form BSF673 can be sent via email/ fax to the Customs office. A list of the CBSA offices providing eLongroom services by email and their email address can be found at: e-Longroom - Manifest (ELR/MANIFEST)