From 5057bcb52462523286ee5804ceead7e6e0d36cbd Mon Sep 17 00:00:00 2001
From: eric <eric@openbsd.org>
Date: Wed, 26 Sep 2018 16:28:34 +0000
Subject: [PATCH] treat NOTIMP as NO_DATA in response to MX query: fallback to
 hostname lookup instead of bouncing the mail.

ok gilles@
---
 usr.sbin/smtpd/dns.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/usr.sbin/smtpd/dns.c b/usr.sbin/smtpd/dns.c
index 86645fa6993..4d369e2479f 100644
--- a/usr.sbin/smtpd/dns.c
+++ b/usr.sbin/smtpd/dns.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dns.c,v 1.87 2018/07/25 16:00:48 eric Exp $	*/
+/*	$OpenBSD: dns.c,v 1.88 2018/09/26 16:28:34 eric Exp $	*/
 
 /*
  * Copyright (c) 2008 Gilles Chehade <gilles@poolp.org>
@@ -240,7 +240,8 @@ dns_dispatch_mx(struct asr_result *ar, void *arg)
 	char			 buf[512];
 	size_t			 found;
 
-	if (ar->ar_h_errno && ar->ar_h_errno != NO_DATA) {
+	if (ar->ar_h_errno && ar->ar_h_errno != NO_DATA &&
+	    ar->ar_h_errno != NOTIMP) {
 
 		m_create(s->p,  IMSG_MTA_DNS_HOST_END, 0, 0, -1);
 		m_add_id(s->p, s->reqid);
-- 
2.20.1