diff --git a/python/mailserver3.py b/python/mailserver3.py
index 0f5c393..b9e6a44 100644
--- a/python/mailserver3.py
+++ b/python/mailserver3.py
@@ -27,6 +27,7 @@ URL = ""
 MAILPORT_TLS = 0
 TLS_CERTIFICATE = ""
 TLS_PRIVATE_KEY = ""
+WEBHOOK_URL = ""
 
 class CustomHandler:
     connection_type = ''