+PUSHDIVERT(-1)
+#
+# Copyright (c) 1983 Eric P. Allman
+# Copyright (c) 1988, 1993
+# The Regents of the University of California. All rights reserved.
+#
+# %sccs.include.redist.sh%
+#
+ifdef(`SMTP_MAILER_FLAGS',,
+ `define(`SMTP_MAILER_FLAGS',
+ `ifdef(`_OLD_SENDMAIL_', `L', `')')')
+POPDIVERT
+############################################
+### Null Client Mailer specification ###
+############################################
+
+#
+# This is used only for relaying mail from a client to a hub when
+# that client does absolutely nothing else -- i.e., it is a "null
+# mailer". In this sense, it acts like the "R" option in Sun
+# sendmail.
+#
+
+VERSIONID(`@(#)nullclient.m4 8.1 (Berkeley) %G%')
+
+ifdef(`confRELAY_MAILER',,
+ `define(`confRELAY_MAILER', `nullclient')')dnl
+
+Mnullclient, P=[IPC], F=CONCAT(mDFMuXa, SMTP_MAILER_FLAGS), A=IPC $h