diff --git a/util/reserved-domains.json b/util/reserved-domains.json
index b31dab44d..9e0603e07 100644
--- a/util/reserved-domains.json
+++ b/util/reserved-domains.json
@@ -1,6 +1,7 @@
 [
     "api",
     "dns",
+    "email",
     "example",
     "m",
     "mail",