diff --git a/utils/invalid-domains.json b/utils/invalid-domains.json
index bf5a89c6e9..891b5d26f9 100644
--- a/utils/invalid-domains.json
+++ b/utils/invalid-domains.json
@@ -14,5 +14,6 @@
   "ww4",
   "_github-pages-challenge-is-a-dev",
   "_github-challenge-is-a-dev",
-  "your-domain-name"
+  "your-domain-name",
+  "mail"
 ]