diff --git a/DMS/Dockerfile b/DMS/Dockerfile
index bcbd697..8b722ec 100644
--- a/DMS/Dockerfile
+++ b/DMS/Dockerfile
@@ -1,13 +1,28 @@
 FROM docker.io/mailserver/docker-mailserver:latest
 
 LABEL maintainer="andreas.knuth@bayarea-cc.com"
-LABEL description="Custom DMS with Python3 support"
+LABEL description="Custom DMS with Python3 support and Sieve Sync"
 
-# Install Python and boto3
+# 1. Python, pip und dependencies installieren
+# croniter hinzufügen!
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
         python3 \
         python3-pip \
-    && pip3 install --break-system-packages --no-cache-dir boto3 \
+    && pip3 install --break-system-packages --no-cache-dir boto3 croniter \
     && apt-get clean \
-    && rm -rf /var/lib/apt/lists/*
\ No newline at end of file
+    && rm -rf /var/lib/apt/lists/*
+
+# 2. Verzeichnis erstellen
+WORKDIR /scripts
+
+# 3. Script kopieren
+COPY sync_dynamodb_to_sieve.py /scripts/sync.py
+RUN chmod +x /scripts/sync.py
+
+# 4. Schedule Konfiguration kopieren (Der Cron-String)
+COPY sieve-schedule /etc/sieve-schedule
+
+# 5. Supervisor Konfiguration kopieren
+# DMS scannt diesen Ordner beim Start
+COPY sieve-supervisor.conf /etc/supervisor/conf.d/sieve-sync.conf
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diff --git a/DMS/sieve-cron b/DMS/sieve-cron
deleted file mode 100644
index 744017d..0000000
--- a/DMS/sieve-cron
+++ /dev/null
@@ -1 +0,0 @@
-*/5 * * * * root python3 /scripts/sync.py >> /var/log/sieve-sync.log 2>&1
diff --git a/DMS/sieve-schedule b/DMS/sieve-schedule
new file mode 100644
index 0000000..410a87c
--- /dev/null
+++ b/DMS/sieve-schedule
@@ -0,0 +1 @@
+*/5 * * * *
\ No newline at end of file
diff --git a/DMS/sieve-supervisor.conf b/DMS/sieve-supervisor.conf
new file mode 100644
index 0000000..cf81c82
--- /dev/null
+++ b/DMS/sieve-supervisor.conf
@@ -0,0 +1,12 @@
+[program:sieve-sync]
+command=/usr/bin/python3 /scripts/sync.py
+# Wichtig: stdout_logfile schickt die Logs an den Docker Log Stream
+# Damit sehen Sie die Logs via "docker logs <container>"
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+autostart=true
+autorestart=true
+startsecs=5
+# Hier werden die ENV Vars des Containers automatisch an das Script vererbt!
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diff --git a/DMS/sync_dynamodb_to_sieve.py b/DMS/sync_dynamodb_to_sieve.py
index f2bb3d6..6330db3 100644
--- a/DMS/sync_dynamodb_to_sieve.py
+++ b/DMS/sync_dynamodb_to_sieve.py
@@ -6,6 +6,13 @@ import boto3
 import os
 from pathlib import Path
 import json
+import time
+from datetime import datetime
+try:
+    from croniter import croniter
+except ImportError:
+    print("Bitte 'croniter' via pip installieren!")
+    exit(1)
 
 # Config
 REGION = 'us-east-2'
@@ -102,4 +109,44 @@ def sync():
         print(f'✓ {email}')
 
 if __name__ == '__main__':
-    sync()
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+    # Pfad zur Cron-Definition (nur der String, z.B. "*/5 * * * *")
+    CRON_FILE = '/etc/sieve-schedule'
+    
+    # Fallback, falls Datei fehlt
+    cron_string = "*/5 * * * *" 
+    
+    if os.path.exists(CRON_FILE):
+        with open(CRON_FILE, 'r') as f:
+            # Kommentare entfernen und String holen
+            content = f.read().strip()
+            if content and not content.startswith('#'):
+                cron_string = content
+
+    print(f"DynamoDB Sieve Sync gestartet. Zeitplan: {cron_string}")
+    print(f"AWS Region: {os.environ.get('AWS_DEFAULT_REGION', 'nicht gesetzt')}") # Debug Check
+
+    # Initialer Lauf beim Start? (Optional, hier auskommentiert)
+    sync()
+
+    # Iterator erstellen
+    base_time = datetime.now()
+    iter = croniter(cron_string, base_time)
+
+    while True:
+        # Den nächsten Zeitpunkt berechnen
+        next_run = iter.get_next(datetime)
+        now = datetime.now()
+        
+        sleep_seconds = (next_run - now).total_seconds()
+        
+        if sleep_seconds > 0:
+            # Warten bis zum nächsten Slot
+            time.sleep(sleep_seconds)
+        
+        try:
+            print(f"[{datetime.now()}] Starte Sync...")
+            sync()
+        except Exception as e:
+            print(f"Fehler beim Sync: {e}")
+            # Wichtig: Bei Fehler nicht abstürzen, sondern weitermachen
+            pass
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