environment (common on Debian/Ubuntu), it might not be able to find system files like /etc/services or resolver libraries. Server Fault
Below is an overview of why this happens and how to resolve it. Common Causes Missing Transport Definitions: Postfix may be trying to use a transport (like private/filter or a custom relay) that is listed in but not defined in Incorrect Relayhost:
environment (common on Debian/Ubuntu), it might not be able to find system files like /etc/services or resolver libraries. Server Fault
Below is an overview of why this happens and how to resolve it. Common Causes Missing Transport Definitions: Postfix may be trying to use a transport (like private/filter or a custom relay) that is listed in but not defined in Incorrect Relayhost: