The client queries will almost certainly break because most
companies will not allow inetd queries.
Then they should not configure their domains with %{u} !!!
They will not be able to read email from a domain that uses the macro.
The effect that you are trying to achieve here is to only allow one process
to send mail from a machine. That can be achieved far more easily by O/S
level configuration. Simply block permission to connect to port 25 outgoing
to any process other than the mail server process.
Protocol should not be a substitute for local machine config.
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