Those options are only available if you have the sysadmin pro module purchased i believe. If not then you will need to manually configure postfix: https://wiki.freepbx.org/display/PPS/Setup+Postfix+Manually
Those options are only available if you have the sysadmin pro module purchased i believe. If not then you will need to manually configure postfix: https://wiki.freepbx.org/display/PPS/Setup+Postfix+Manually