Use ImprovMX

domains/21z.json

@@ -5,6 +5,10 @@
         "discord": "780356848737058857"
     },
     "record": {
-        "CNAME": "21z.github.io"
+        "MX": [
+            "mx1.improvmx.com",
+            "mx2.improvmx.com"
+          ],
+        "TXT": "v=spf1 include:spf.improvmx.com ~all"
     }
 }