diff --git a/domains/majorhead.json b/domains/majorhead.json
index 1c75d0e94b..2f36676791 100644
--- a/domains/majorhead.json
+++ b/domains/majorhead.json
@@ -6,6 +6,6 @@
     "record": {
         "A": ["217.174.245.249"],
         "TXT": "v=spf1 a mx ip4:217.174.245.249 ~all",
-        "MX": "hosts.is-a.dev"
+        "MX": ["hosts.is-a.dev"]
     }
-}
\ No newline at end of file
+}