A mandatory patch - otherwise RBL does not work right.

diff -u -r1.10 mxverify.c
--- smtpserver/mxverify.c	1999/04/11 00:18:19	1.10
+++ smtpserver/mxverify.c	1999/04/14 17:35:20
@@ -451,7 +451,7 @@
 	char hbuf[2000], *s, *suf;
 	/* int hspc; */
 
-	if (ipaf == AF_INET) {
+	if (ipaf == P_K_IPv4) {
 	  sprintf(hbuf, "%d.%d.%d.%d.",
 		  ipaddr[3], ipaddr[2], ipaddr[1], ipaddr[0]);