Postal even now supports the version one (or legacy) configuration format from Postal v2 and previously. In case you are applying this config file, you can receive a warning during the logs when starting off Postal. We advocate Altering your configuration to Adhere to the new v2 format which https://beaunzkmz.pointblog.net/not-known-factual-statements-about-magento-2-optimization-67827049