Update sabidzpro.json to include ImprovMX MX and TXT records for email configuration

domains/sabidzpro.json

@@ -7,6 +7,13 @@
   },
   "proxied": true,
   "records": {
-    "CNAME": "sabidzpro.vercel.app"
+    "CNAME": "sabidzpro.vercel.app",
+    "MX": [
+      "mx1.improvmx.com",
+      "mx2.improvmx.com"
+    ],
+    "TXT": [
+      "v=spf1 include:spf.improvmx.com ~all"
+    ]
   }
-}
+}