Yes you need to update the firmware with the brother internet fax tool. https://support.brother.com/g/b/branch/downloadend.aspx?c=gb&lang=en&prod=mfcl8690cdw_eu_as&os=10013&dlid=dlf004627_000&flang=4&type3=78
After you do that, you'll see the option under smtp in the advanced network settings.