Apply by doing:
        cd /usr/src
        patch -p0 < 010_sendmail.patch
	cd usr.sbin/sendmail
	make
	make install

Index: usr.sbin/sendmail/src/main.c
===================================================================
RCS file: /cvs/src/usr.sbin/sendmail/src/main.c,v
retrieving revision 1.14
retrieving revision 1.15
diff -u -r1.14 -r1.15
--- usr.sbin/sendmail/src/main.c	1999/01/01 20:33:49	1.14
+++ usr.sbin/sendmail/src/main.c	1999/11/24 19:27:17	1.15
@@ -984,6 +984,18 @@
 		usrerr("Permission denied");
 		finis(FALSE, EX_USAGE);
 	}
+	if (OpMode == MD_INITALIAS &&
+	    RealUid != 0 &&
+	    RealUid != TrustedUid &&
+	    !wordinclass(RealUserName, 't'))
+	{
+		if (LogLevel > 1)
+			sm_syslog(LOG_ALERT, NOQID,
+				  "user %d attempted to rebuild the alias map",
+				  RealUid);
+ 		usrerr("Permission denied");
+ 		finis(FALSE, EX_USAGE);
+ 	}
 
 	if (MeToo)
 		BlankEnvelope.e_flags |= EF_METOO;