Add MX and TXT records to nhatminh.json

domains/nhatminh.json

@@ -3,6 +3,13 @@
     "username": "nhatminh132"
   },
   "records": {
-    "A": ["216.198.79.1"]
+    "A": ["216.198.79.1"],
+    "MX": [
+      "mx1.improvmx.com",
+      "mx2.improvmx.com"
+    ],
+    "TXT": [
+      "v=spf1 include:spf.improvmx.com ~all"
+    ]
   }
 }