Postal however supports the Edition one (or legacy) configuration structure from Postal v2 and previously. For anyone who is using this config file, you'll receive a warning within the logs when setting up Postal. We advise changing your configuration to Adhere to the new v2 structure which is documented https://chanceritfp.getblogs.net/59153179/helping-the-others-realize-the-advantages-of-magento-2-migration