Index: srvrsmtp.c
===================================================================
RCS file: /cvs/sendmail/srvrsmtp.c,v
retrieving revision 8.948
diff -u -r8.948 srvrsmtp.c
--- srvrsmtp.c	15 Aug 2006 23:24:58 -0000	8.948
+++ srvrsmtp.c	24 Aug 2006 16:47:19 -0000
@@ -945,7 +945,9 @@
 		char *response;
 
 		q = macvalue(macid("{client_name}"), e);
-		SM_ASSERT(q != NULL);
+		SM_ASSERT(q != NULL || OpMode == MD_SMTP);
+		if (q == NULL)
+			q = "localhost";
 		response = milter_connect(q, RealHostAddr, e, &state);
 		switch (state)
 		{