From d3a5db394cb3e028ea8d4ce44ede15c37d8ed445 Mon Sep 17 00:00:00 2001
From: Phil Jaenke <prj@rootwyrm.com>
Date: Fri, 15 May 2020 16:06:59 -0400
Subject: [PATCH] Make pInvalidDomainDNS more forgiving

Make the pInvalidDomainDNS check more forgiving to accommodate newly created domains which also do not have an A record for the domain (which is generally not a best practice) or MX configured yet.
This adds a check for an `NS` record; if the NS exists, then the domain is valid and can be assumed to have just not been configured to receive email yet.
---
 functions.inc.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/functions.inc.php b/functions.inc.php
index 6e74f9c3..3c63ff1c 100644
--- a/functions.inc.php
+++ b/functions.inc.php
@@ -248,6 +248,8 @@ function check_domain($domain) {
                 $retval = '';
             } elseif (checkdnsrr($domain, 'MX')) {
                 $retval = '';
+            } elseif (checkdnsrr($domain, 'NS')) {
+                $retval = '';
             } else {
                 $retval = sprintf(Config::lang('pInvalidDomainDNS'), htmlentities($domain));
             }