The electronic signature guarantees the secure and fastest possible authentication of payment files (within the context of data telecommunication). However, BL Banking also has the option to transmit orders without electronic signature by faxing or mailing the bank an accompanying ticket with hand-signed signatures as acknowledgments.
Do so by clicking on Transfer file to bank in the Actions menu and then set the Manual approval checkbox. You can set the preferences under File transfers - Display approval option to determine whether or not to display this checkbox.
You can find more information about this function in section File transfers - Send file.