+delivery (local) forking for transport-filter
+postfork: transport-filter
+fresh-exec 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