treat NOTIMP as NO_DATA in response to MX query: fallback to hostname lookup

instead of bouncing the mail.

ok gilles@

diff --git a/usr.sbin/smtpd/dns.c b/usr.sbin/smtpd/dns.c
index 86645fa..4d369e2 100644 (file)
--- 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);