hook to invalidate, if mailaccount userdata changes

api/src/Mail/Smtp/Sql.php

@@ -339,6 +339,13 @@ class Sql extends Mail\Smtp
 				}
 			}
 		}
+
+		// let interesed parties know account was update
+		Api\Hooks::process(array(
+			'location' => 'mailaccount_userdata_updated',
+			'account_id' => $_uidnumber,
+		));
+
 		return true;
 	}