$NetBSD: patch-af,v 1.12 2014/06/15 20:48:50 jnemeth Exp $

--- sendmail/conf.c.orig	2014-05-20 17:24:39.000000000 +0000
+++ sendmail/conf.c
@@ -43,6 +43,10 @@ SM_RCSID("@(#)$Id: conf.c,v 8.1191 2014-
 # include <ulimit.h>
 #endif /* HASULIMIT && defined(HPUX11) */
 
+#if !HAS_GETHOSTBYNAME2
+extern struct __res_state sm_res;
+#endif
+
 static void	setupmaps __P((void));
 static void	setupmailers __P((void));
 static void	setupqueues __P((void));
@@ -4242,13 +4246,13 @@ sm_getipnodebyname(name, family, flags, 
 	if (family == AF_INET6)
 	{
 		/* From RFC2133, section 6.1 */
-		resv6 = bitset(RES_USE_INET6, _res.options);
-		_res.options |= RES_USE_INET6;
+		resv6 = bitset(RES_USE_INET6, sm_res.options);
+		sm_res.options |= RES_USE_INET6;
 	}
 	SM_SET_H_ERRNO(0);
 	h = gethostbyname(name);
 	if (!resv6)
-		_res.options &= ~RES_USE_INET6;
+		sm_res.options &= ~RES_USE_INET6;
 
 	/* the function is supposed to return only the requested family */
 	if (h != NULL && h->h_addrtype != family)
@@ -4463,7 +4467,8 @@ sm_gethostbyaddr(addr, len, type)
 
 #if NETINET6
 	if (type == AF_INET6 &&
-	    IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *) addr))
+	    (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *) addr) ||
+	    IN6_IS_ADDR_LINKLOCAL((struct in6_addr *) addr)))
 	{
 		/* Avoid reverse lookup for IPv6 unspecified address */
 		SM_SET_H_ERRNO(HOST_NOT_FOUND);