diff --git a/api/apps/user_app.py b/api/apps/user_app.py
index a78fad5df..1cf85986c 100644
--- a/api/apps/user_app.py
+++ b/api/apps/user_app.py
@@ -566,7 +566,7 @@ def user_add():
     email_address = req["email"]
 
     # Validate the email address
-    if not re.match(r"^[\w\._-]+@([\w_-]+\.)+[\w-]{2,5}$", email_address):
+    if not re.match(r"^[\w\._-]+@([\w_-]+\.)+[\w-]{2,}$", email_address):
         return get_json_result(
             data=False,
             message=f"Invalid email address: {email_address}!",