diff --git a/email-worker/email_processing/rules_processor.py b/email-worker/email_processing/rules_processor.py
index f3bfd31..743ee34 100644
--- a/email-worker/email_processing/rules_processor.py
+++ b/email-worker/email_processing/rules_processor.py
@@ -41,7 +41,7 @@ class RulesProcessor:
             worker_name: Worker name for logging
             metrics_callback: Optional callback to increment metrics
         """
-        rule = self.dynamodb.get_email_rules(recipient)
+        rule = self.dynamodb.get_email_rules(recipient.lower())
         
         if not rule:
             return False  # NEU: Return-Wert