Add MX and TXT records to detox-in.json

Added MX and TXT records to the DNS configuration.

domains/detox-in.json

@@ -4,6 +4,11 @@
         "email": "anshulprajapati2220@gmail.com"
     },
     "records": {
-        "CNAME": "anshulpj12.github.io"
+        "CNAME": "anshulpj12.github.io",
+        "MX": [
+            "mx1.improvmx.com.",
+            "mx2.improvmx.com."
+        ],
+        "TXT": "v=spf1 include:spf.improvmx.com ~all"
     }
 }