Change MX record format from object to array

domains/send.cieldt.json

@@ -5,9 +5,11 @@
     },
     "records": {
         "TXT": "v=spf1 include:amazonses.com ~all",
-        "MX": {
-            "value": "feedback-smtp.ap-northeast-1.amazonses.com",
-            "priority": 10
-        }
+        "MX": [
+            {
+                "value": "feedback-smtp.ap-northeast-1.amazonses.com",
+                "priority": 10
+            }
+        ]
     }
 }