diff --git a/account/account.py b/account/account.py
index 4f13090..e127b23 100644
--- a/account/account.py
+++ b/account/account.py
@@ -19,6 +19,8 @@ runport = config.get("Account", "port")
 print("HectaMail Account Service is starting up...")
 print("Your database is located at:", database)
 
+allowed_pattern = r'^[a-zA-Z0-9.]+$'
+
 def is_valid_input(input_string):
     return re.match(allowed_pattern, input_string) is not None