diff --git a/DMS/sync_dynamodb_to_sieve.py b/DMS/sync_dynamodb_to_sieve.py
index b9e152d..3c2597e 100644
--- a/DMS/sync_dynamodb_to_sieve.py
+++ b/DMS/sync_dynamodb_to_sieve.py
@@ -52,8 +52,14 @@ def sync():
         user = email.split('@')[0]
         
         # Path: /var/mail/domain.de/user/.dovecot.sieve
-        sieve_path = Path(VMAIL_BASE) / domain / user / '.dovecot.sieve'
-        sieve_path.parent.mkdir(parents=True, exist_ok=True)
+        mailbox_dir = Path(VMAIL_BASE) / domain / user
+        
+        # Skip if mailbox doesn't exist
+        if not mailbox_dir.exists():
+            print(f'⚠ Skipped {email} (mailbox not found)')
+            continue
+        
+        sieve_path = mailbox_dir / '.dovecot.sieve'
         
         # Generate & write
         script = generate_sieve(email, item)