--- /dev/null
+
+# This transport is used for handling pipe deliveries generated by
+# .forward files. If the commands fails and produces any output on standard
+# output or standard error streams, the output is returned to the sender
+# of the message as a delivery error.
+address_pipe:
+ debug_print = "T: address_pipe for $local_part@$domain"
+ driver = pipe
+ return_fail_output
+