From c6715ee6bf28db578a1f842d83453f3482abff67 Mon Sep 17 00:00:00 2001
From: AJ ONeal <aj@daplie.com>
Date: Thu, 19 Oct 2017 12:15:45 -0600
Subject: [PATCH] terminate MX label with null

---
 packer/type.mx.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/packer/type.mx.js b/packer/type.mx.js
index 910e47c..2b472c4 100644
--- a/packer/type.mx.js
+++ b/packer/type.mx.js
@@ -22,7 +22,7 @@ exports.DNS_PACKER_TYPE_MX = function (ab, dv, total, record) {
   // 16-bit priority and a sequence of labels as the exchange
   record.exchange.split('.').forEach(function (label) {
     mxLen += 1 + label.length;
-    
+
     dv.setUint8(total, label.length, false);
     total += 1;
 
@@ -31,10 +31,13 @@ exports.DNS_PACKER_TYPE_MX = function (ab, dv, total, record) {
       total += 1;
     });
   });
+  dv.setUint8(total, 0, false);
+  total += 1;
+  mxLen += 1;
 
   // RDLENGTH
   dv.setUint16(rdLenIndex, mxLen, false);
-  
+
   return total;
 };