+delivery-local forking for transport-filter
+postfork: transport-filter
+local-accept-delivery forked for delivery-local: npppp
+delivery-local forked for transport-filter: npppp
+process pppp running as transport filter: fd_write=dddd fd_read=dddd
+delivery-local forking for transport filter writer
+postfork: transport filter writer
+cannot use sendfile for body: spoolfile not wireformat