Update nipun.json

added email client for the subdomain.

domains/nipun.json

@@ -4,6 +4,8 @@
         "email": "nipyantha@gmail.com"
     },
     "records": {
-        "A": ["216.24.57.1"]
+        "A": ["216.24.57.1"],
+        "MX": ["mx1.improvmx.com", "mx2.improvmx.com"],
+        "TXT": ["v=spf1 include:spf.improvmx.com ~all"]
     }
 }