add MX and TXT record to ben.is-a.dev for improvmx

domains/ben.json

@@ -5,6 +5,11 @@
     },
 
     "record": {
-        "CNAME": "justpiple.github.io"
+        "CNAME": "justpiple.github.io",
+        "MX": [
+          "mx1.improvmx.com",
+          "mx2.improvmx.com"
+        ],
+        "TXT": "v=spf1 include:spf.improvmx.com ~all"
     }
 }