Postal continue to supports the version one (or legacy) configuration structure from Postal v2 and previously. In case you are utilizing this config file, you will get a warning within the logs when beginning Postal. We propose changing your configuration to Adhere to the new v2 format that's documented https://claytonvjvhr.bcbloggers.com/26550503/5-essential-elements-for-red-hat-virtualization-install