diff --git a/dns.type.mx.js b/dns.type.mx.js
index d98771e..13a05cd 100644
--- a/dns.type.mx.js
+++ b/dns.type.mx.js
@@ -20,8 +20,8 @@ exports.DNS_TYPE_MX = function (ab, packet, record) {
     var data = '';
 
     var s = {
-       priority:    ''
-     , exchange:    ''
+       priority:    ''  // also known as preference
+     , exchange:    ''  //     
         
     };
     var temp = ''
@@ -48,13 +48,22 @@ exports.DNS_TYPE_MX = function (ab, packet, record) {
             data = dv.getUint8(i, false);
             temp = String.fromCharCode(data);
             console.log("data at index " + i + ":" + temp);
+            
+            if ((temp.trim() === ''  && i > 2) || (!temp.match(/^[a-zA-Z0-9._-]+$/) && i > 2)) {
+                s.exchange += ".";
+            }
 
             temp = temp.match(/^[a-zA-Z0-9._-]+$/);
+
+            // if temp is null, do nothing
             if (temp === null){
 
+
+                // otherwise, append to s.exchange
             }else{
 
                 s.exchange += temp;
+
             }
 
             
@@ -66,7 +75,7 @@ exports.DNS_TYPE_MX = function (ab, packet, record) {
 
     }
 
-    // s.exchange = unpackLabels(new Uint8Array(ab), record.rdstart, { byteLength: 0, cpcount: 0, labels: [], name: '' }).labels;
+    // s.exchange = unpackLabels(new Uint8Array(ab), record.rdstart, { byteLength: 0, cpcount: 0, labels: [], name: '' }).name;
 
     return s;