diff --git a/email_api/docker-compose.yml b/email_api/docker-compose.yml
index f5ecaf5..c69ab97 100644
--- a/email_api/docker-compose.yml
+++ b/email_api/docker-compose.yml
@@ -6,10 +6,16 @@ services:
     network_mode: host
     volumes:
       - ./email_api:/app
+      - /var/mail:/var/mail  # Maildir-Zugriff für Health-Check
     working_dir: /app
     env_file:
       - .env
     environment:
       - API_TOKEN=${API_TOKEN}
+      - AWS_REGION=${AWS_REGION}
+      - AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID}
+      - AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY}
     command: >
-      bash -c "pip install --upgrade pip && pip install flask python-dotenv && python app.py"
\ No newline at end of file
+      bash -c "pip install --upgrade pip && 
+               pip install flask python-dotenv boto3 && 
+               python app.py"
\ No newline at end of file
diff --git a/email_api/email_api/app.py b/email_api/email_api/app.py
index b38e121..098dc28 100644
--- a/email_api/email_api/app.py
+++ b/email_api/email_api/app.py
@@ -1,10 +1,13 @@
 import sys
-from flask import Flask, request, jsonify
+from flask import Flask, request, jsonify, g
 import smtplib
 import base64
 import gzip
 import logging
 import os
+import time
+import boto3
+from pathlib import Path
 from dotenv import load_dotenv
 from email.parser import BytesParser
 from email.policy import default
@@ -25,13 +28,253 @@ logger = logging.getLogger(__name__)
 SMTP_HOST = "localhost"  # Host-Netzwerkmodus
 SMTP_PORT = 25  # Fest auf Port 25 ohne TLS
 API_TOKEN = os.environ.get('API_TOKEN')
+MAIL_DIR = "/var/mail"  # Standard Maildir-Pfad
+AWS_REGION = os.environ.get('AWS_REGION', 'us-east-1')
+
 if not API_TOKEN:
     raise ValueError("API_TOKEN Umgebungsvariable nicht gesetzt")
 
+# S3-Client initialisieren
+s3_client = boto3.client('s3', region_name=AWS_REGION)
+
+# Cache für verarbeitete Requests
+processed_requests = {}
+
 logger.info(f"API_TOKEN loaded: {API_TOKEN}")
 
+def load_domains_config():
+    """Lädt die Domain-Konfiguration"""
+    # Hier könntest du eine echte Konfigurationsdatei laden
+    # Für jetzt als Beispiel hardcoded
+    return {
+        "andreasknuth.de": {"bucket": "andreasknuth-de-emails"},
+        # Weitere Domains können hier hinzugefügt werden
+    }
+
+def get_bucket_name_for_domain(domain):
+    """Konvertiert Domain-Namen zu S3-Bucket-Namen"""
+    return domain.replace(".", "-") + "-emails"
+
+def mark_email_as_processed(bucket_name, key):
+    """Markiert eine E-Mail als erfolgreich verarbeitet"""
+    try:
+        # Füge Metadata hinzu, um zu markieren, dass die E-Mail verarbeitet wurde
+        s3_client.copy_object(
+            Bucket=bucket_name,
+            Key=key,
+            CopySource={'Bucket': bucket_name, 'Key': key},
+            Metadata={
+                'processed': 'true',
+                'processed_timestamp': str(int(time.time())),
+                'processor': 'rest-api'
+            },
+            MetadataDirective='REPLACE'
+        )
+        logger.info(f"E-Mail {key} als verarbeitet markiert")
+        return True
+    except Exception as e:
+        logger.error(f"Fehler beim Markieren der E-Mail {key}: {str(e)}")
+        return False
+
+def get_unprocessed_emails(bucket_name):
+    """Holt alle unverarbeiteten E-Mails aus einem S3-Bucket"""
+    try:
+        unprocessed_emails = []
+        paginator = s3_client.get_paginator('list_objects_v2')
+        
+        for page in paginator.paginate(Bucket=bucket_name):
+            if 'Contents' not in page:
+                continue
+                
+            for obj in page['Contents']:
+                key = obj['Key']
+                
+                # Prüfe Metadata der E-Mail
+                try:
+                    head_response = s3_client.head_object(Bucket=bucket_name, Key=key)
+                    metadata = head_response.get('Metadata', {})
+                    
+                    # Wenn nicht als verarbeitet markiert, zur Liste hinzufügen
+                    if metadata.get('processed') != 'true':
+                        unprocessed_emails.append({
+                            'key': key,
+                            'size': obj['Size'],
+                            'last_modified': obj['LastModified'].isoformat(),
+                            'metadata': metadata
+                        })
+                except Exception as e:
+                    logger.warning(f"Fehler beim Prüfen der Metadata für {key}: {str(e)}")
+                    # Wenn Metadata nicht gelesen werden kann, als unverarbeitet betrachten
+                    unprocessed_emails.append({
+                        'key': key,
+                        'size': obj['Size'],
+                        'last_modified': obj['LastModified'].isoformat(),
+                        'metadata': {}
+                    })
+        
+        return unprocessed_emails
+    except Exception as e:
+        logger.error(f"Fehler beim Abrufen unverarbeiteter E-Mails: {str(e)}")
+        return []
+
+@app.route('/health', methods=['GET'])
+def health_check():
+    """Erweiterte Gesundheitsprüfung"""
+    
+    # Basis-Gesundheitscheck
+    health_status = {
+        "status": "OK",
+        "message": "S3 E-Mail Processor API ist aktiv",
+        "timestamp": int(time.time()),
+        "version": "2.0",
+        "request_id": getattr(g, 'request_id', 'health-check')
+    }
+    
+    # Erweiterte Checks
+    try:
+        # Maildir-Zugriff prüfen
+        mail_path = Path(MAIL_DIR)
+        if mail_path.exists() and mail_path.is_dir():
+            health_status["mail_dir"] = "accessible"
+        else:
+            health_status["mail_dir"] = "not_accessible"
+            health_status["status"] = "WARNING"
+        
+        # Domain-Konfiguration prüfen
+        domains = load_domains_config()
+        health_status["configured_domains"] = len(domains)
+        health_status["domains"] = list(domains.keys())
+        
+        # Cache-Status
+        health_status["request_cache_size"] = len(processed_requests)
+        
+        # SMTP-Verbindung testen
+        try:
+            with smtplib.SMTP(SMTP_HOST, SMTP_PORT, timeout=5) as smtp:
+                smtp.noop()
+            health_status["smtp_connection"] = "OK"
+        except Exception as e:
+            health_status["smtp_connection"] = f"ERROR: {str(e)}"
+            health_status["status"] = "WARNING"
+        
+        # S3-Verbindung testen
+        try:
+            s3_client.list_buckets()
+            health_status["s3_connection"] = "OK"
+        except Exception as e:
+            health_status["s3_connection"] = f"ERROR: {str(e)}"
+            health_status["status"] = "WARNING"
+        
+    except Exception as e:
+        health_status["status"] = "ERROR"
+        health_status["error"] = str(e)
+    
+    return jsonify(health_status)
+
+@app.route('/retry/<domain>', methods=['GET'])
+def retry_domain_emails(domain):
+    """Verarbeitet alle unverarbeiteten E-Mails für eine Domain"""
+    auth_header = request.headers.get('Authorization')
+    if not auth_header or auth_header != f'Bearer {API_TOKEN}':
+        return jsonify({'error': 'Unauthorized'}), 401
+    
+    request_id = f"retry-{domain}-{int(time.time())}"
+    bucket_name = get_bucket_name_for_domain(domain)
+    
+    logger.info(f"[{request_id}] Retry-Verarbeitung für Domain: {domain}, Bucket: {bucket_name}")
+    
+    try:
+        # Hole alle unverarbeiteten E-Mails
+        unprocessed_emails = get_unprocessed_emails(bucket_name)
+        
+        if not unprocessed_emails:
+            return jsonify({
+                'message': f'Keine unverarbeiteten E-Mails für Domain {domain} gefunden',
+                'domain': domain,
+                'bucket': bucket_name,
+                'processed_count': 0,
+                'request_id': request_id
+            }), 200
+        
+        processed_count = 0
+        failed_count = 0
+        errors = []
+        
+        for email_info in unprocessed_emails:
+            key = email_info['key']
+            
+            try:
+                logger.info(f"[{request_id}] Verarbeite E-Mail: {key}")
+                
+                # E-Mail aus S3 laden
+                response = s3_client.get_object(Bucket=bucket_name, Key=key)
+                email_content = response['Body'].read()
+                
+                # E-Mail parsen
+                email_msg = BytesParser(policy=default).parsebytes(email_content)
+                
+                # From-Adresse extrahieren
+                from_headers = email_msg.get_all('from', [])
+                if from_headers:
+                    from_addr = getaddresses(from_headers)[0][1]
+                else:
+                    from_addr = f'retry@{domain}'
+                
+                # Empfänger extrahieren
+                to_addrs = [addr for _name, addr in getaddresses(email_msg.get_all('to', []))]
+                cc_addrs = [addr for _name, addr in getaddresses(email_msg.get_all('cc', []))]
+                bcc_addrs = [addr for _name, addr in getaddresses(email_msg.get_all('bcc', []))]
+                recipients = to_addrs + cc_addrs + bcc_addrs
+                
+                if not recipients:
+                    raise ValueError(f"Keine Empfänger in E-Mail {key} gefunden")
+                
+                # An SMTP weiterleiten
+                with smtplib.SMTP(SMTP_HOST, SMTP_PORT) as smtp:
+                    smtp.mail(from_addr)
+                    for recipient in recipients:
+                        smtp.rcpt(recipient)
+                    smtp.data(email_content)
+                
+                # Als verarbeitet markieren
+                mark_email_as_processed(bucket_name, key)
+                processed_count += 1
+                
+                logger.info(f"[{request_id}] E-Mail {key} erfolgreich verarbeitet")
+                
+            except Exception as e:
+                failed_count += 1
+                error_msg = f"Fehler bei E-Mail {key}: {str(e)}"
+                errors.append(error_msg)
+                logger.error(f"[{request_id}] {error_msg}")
+        
+        result = {
+            'message': f'Retry-Verarbeitung für Domain {domain} abgeschlossen',
+            'domain': domain,
+            'bucket': bucket_name,
+            'total_found': len(unprocessed_emails),
+            'processed_count': processed_count,
+            'failed_count': failed_count,
+            'request_id': request_id
+        }
+        
+        if errors:
+            result['errors'] = errors
+        
+        return jsonify(result), 200
+        
+    except Exception as e:
+        logger.error(f"[{request_id}] Fehler bei Retry-Verarbeitung: {str(e)}")
+        return jsonify({
+            'error': str(e),
+            'domain': domain,
+            'bucket': bucket_name,
+            'request_id': request_id
+        }), 500
+
 @app.route('/process/<domain>', methods=['POST'])
 def process_email(domain):
+    """Verarbeitet eine einzelne E-Mail von der Lambda-Funktion"""
     auth_header = request.headers.get('Authorization')
     if not auth_header or auth_header != f'Bearer {API_TOKEN}':
         return jsonify({'error': 'Unauthorized'}), 401
@@ -43,8 +286,12 @@ def process_email(domain):
     request_id = data.get('request_id')
     email_content = data.get('email_content')
     compressed = data.get('compressed', False)
+    s3_key = data.get('s3_key')  # S3-Key für Marker-Funktionalität
+    s3_bucket = data.get('s3_bucket')  # S3-Bucket für Marker-Funktionalität
 
     logger.info(f"[{request_id}] Processing email for domain: {domain}")
+    if s3_key:
+        logger.info(f"[{request_id}] S3 Location: {s3_bucket}/{s3_key}")
 
     try:
         # Entkomprimieren, falls komprimiert
@@ -62,7 +309,7 @@ def process_email(domain):
         if from_headers:
             from_addr = getaddresses(from_headers)[0][1]
         else:
-            from_addr = 'lambda@andreasknuth.de'  # Fallback
+            from_addr = f'lambda@{domain}'  # Fallback mit Domain
         
         # Empfänger aus allen relevanten Headern extrahieren (konsistent mit Lambda)
         to_addrs = [addr for _name, addr in getaddresses(email_msg.get_all('to', []))]
@@ -94,11 +341,32 @@ def process_email(domain):
             
         logger.info(f"[{request_id}] Email forwarded to Postfix for {domain} - {len(recipients)} recipients")
 
+        # E-Mail als verarbeitet markieren, falls S3-Informationen vorhanden
+        marked_as_processed = False
+        if s3_key and s3_bucket:
+            if mark_email_as_processed(s3_bucket, s3_key):
+                logger.info(f"[{request_id}] E-Mail {s3_key} als verarbeitet markiert")
+                marked_as_processed = True
+            else:
+                logger.warning(f"[{request_id}] Konnte E-Mail {s3_key} nicht als verarbeitet markieren")
+        elif s3_key:
+            # Fallback: Bucket-Name aus Domain ableiten
+            bucket_name = get_bucket_name_for_domain(domain)
+            if mark_email_as_processed(bucket_name, s3_key):
+                logger.info(f"[{request_id}] E-Mail {s3_key} als verarbeitet markiert (abgeleiteter Bucket: {bucket_name})")
+                marked_as_processed = True
+            else:
+                logger.warning(f"[{request_id}] Konnte E-Mail {s3_key} nicht als verarbeitet markieren")
+
         return jsonify({
             'message': 'Email processed', 
             'request_id': request_id,
+            'domain': domain,
             'recipients_count': len(recipients),
-            'recipients': recipients
+            'recipients': recipients,
+            'marked_as_processed': marked_as_processed,
+            's3_bucket': s3_bucket,
+            's3_key': s3_key
         }), 200
         
     except Exception as e:
diff --git a/ses-lambda/lambda-function.py b/ses-lambda/lambda-function.py
new file mode 100644
index 0000000..b538b9d
--- /dev/null
+++ b/ses-lambda/lambda-function.py
@@ -0,0 +1,214 @@
+# Optimiertes Lambda mit Verbesserungen
+import json
+import os
+import urllib.request
+import urllib.error
+import urllib.parse
+import logging
+import ssl
+import boto3
+import base64
+import hashlib
+import time
+import gzip
+
+# Konfiguration
+API_BASE_URL = os.environ['API_BASE_URL']
+API_TOKEN = os.environ['API_TOKEN']
+DEBUG_MODE = os.environ.get('DEBUG_MODE', 'false').lower() == 'true'
+MAX_EMAIL_SIZE = int(os.environ.get('MAX_EMAIL_SIZE', '10485760'))  # 10MB Standard
+
+logger = logging.getLogger()
+logger.setLevel(logging.INFO)
+
+def bucket_name_to_domain(bucket_name):
+    """Konvertiert S3-Bucket-Namen zu Domain-Namen"""
+    # Beispiel: andreasknuth-de-emails -> andreasknuth.de
+    if bucket_name.endswith('-emails'):
+        # Entferne das "-emails" Suffix
+        domain_part = bucket_name[:-7]  # Entferne die letzten 7 Zeichen ("-emails")
+        # Ersetze alle verbleibenden "-" durch "."
+        domain = domain_part.replace('-', '.')
+        return domain
+    else:
+        # Fallback: Bucket-Name entspricht nicht dem erwarteten Schema
+        logger.warning(f"Bucket-Name {bucket_name} entspricht nicht dem erwarteten Schema")
+        return None
+
+def lambda_handler(event, context):
+    """Optimierter Lambda-Handler mit verbesserter Fehlerbehandlung"""
+    
+    # Eindeutige Request-ID für Tracking
+    request_id = context.aws_request_id
+    logger.info(f"[{request_id}] S3-Ereignis empfangen")
+    
+    try:
+        # S3-Event-Details extrahieren
+        s3_event = event['Records'][0]['s3']
+        bucket_name = s3_event['bucket']['name']
+        object_key = urllib.parse.unquote_plus(s3_event['object']['key'])
+        
+        logger.info(f"[{request_id}] Verarbeite: {bucket_name}/{object_key}")
+        
+        # Domain automatisch aus Bucket-Namen ermitteln
+        domain = bucket_name_to_domain(bucket_name)
+        if not domain:
+            logger.error(f"[{request_id}] Konnte Domain nicht aus Bucket-Namen {bucket_name} ermitteln")
+            return {'statusCode': 400, 'body': json.dumps('Ungültiger Bucket-Name')}
+        
+        logger.info(f"[{request_id}] Ermittelte Domain: {domain}")
+        
+        # Duplikat-Check mit S3-ETag
+        s3_client = boto3.client('s3')
+        head_response = s3_client.head_object(Bucket=bucket_name, Key=object_key)
+        etag = head_response['ETag'].strip('"')
+        content_length = head_response['ContentLength']
+        
+        # E-Mail-Größe prüfen
+        if content_length > MAX_EMAIL_SIZE:
+            logger.warning(f"[{request_id}] E-Mail zu groß: {content_length} Bytes (max: {MAX_EMAIL_SIZE})")
+            # Große E-Mails markieren statt löschen
+            mark_large_email(s3_client, bucket_name, object_key, content_length)
+            return {'statusCode': 413, 'body': json.dumps('E-Mail zu groß')}
+        
+        # E-Mail laden
+        try:
+            response = s3_client.get_object(Bucket=bucket_name, Key=object_key)
+            email_content = response['Body'].read()
+            logger.info(f"[{request_id}] E-Mail geladen: {len(email_content)} Bytes")
+            
+        except Exception as e:
+            logger.error(f"[{request_id}] Fehler beim Laden der E-Mail: {str(e)}")
+            return {'statusCode': 500, 'body': json.dumps(f'S3-Fehler: {str(e)}')}
+        
+        # E-Mail-Content komprimieren für Übertragung
+        compressed_content = gzip.compress(email_content)
+        email_base64 = base64.b64encode(compressed_content).decode('utf-8')
+        
+        # Payload erstellen
+        payload = {
+            's3_bucket': bucket_name,  # S3-Bucket für Marker-Funktionalität
+            's3_key': object_key,      # S3-Key für Marker-Funktionalität
+            'domain': domain,
+            'email_content': email_base64,
+            'compressed': True,  # Flag für API
+            'etag': etag,
+            'request_id': request_id,
+            'original_size': len(email_content),
+            'compressed_size': len(compressed_content)
+        }
+        
+        # API aufrufen mit Retry-Logik
+        success = call_api_with_retry(payload, domain, request_id)
+        
+        if success:
+            # Bei Erfolg: E-Mail aus S3 löschen
+            try:
+                s3_client.delete_object(Bucket=bucket_name, Key=object_key)
+                logger.info(f"[{request_id}] E-Mail erfolgreich verarbeitet und gelöscht")
+                return {
+                    'statusCode': 200,
+                    'body': json.dumps({
+                        'message': 'E-Mail erfolgreich verarbeitet',
+                        'request_id': request_id,
+                        'domain': domain
+                    })
+                }
+            except Exception as e:
+                logger.error(f"[{request_id}] Konnte E-Mail nicht löschen: {str(e)}")
+                # Trotzdem Erfolg melden, da E-Mail verarbeitet wurde
+                return {'statusCode': 200, 'body': json.dumps('Verarbeitet, aber nicht gelöscht')}
+        else:
+            # Bei Fehler: E-Mail in S3 belassen für späteren Retry
+            logger.error(f"[{request_id}] E-Mail bleibt in S3 für Retry: {bucket_name}/{object_key}")
+            return {'statusCode': 500, 'body': json.dumps('API-Fehler')}
+            
+    except Exception as e:
+        logger.error(f"[{request_id}] Unerwarteter Fehler: {str(e)}", exc_info=True)
+        return {'statusCode': 500, 'body': json.dumps(f'Lambda-Fehler: {str(e)}')}
+
+def call_api_with_retry(payload, domain, request_id, max_retries=3):
+    """API-Aufruf mit Retry-Logik"""
+    
+    sync_url = f"{API_BASE_URL}/process/{domain}"
+    payload_json = json.dumps(payload).encode('utf-8')
+    
+    for attempt in range(max_retries):
+        logger.info(f"[{request_id}] API-Aufruf Versuch {attempt + 1}/{max_retries}")
+        
+        try:
+            # Request erstellen
+            req = urllib.request.Request(sync_url, data=payload_json, method="POST")
+            req.add_header('Authorization', f'Bearer {API_TOKEN}')
+            req.add_header('Content-Type', 'application/json')
+            req.add_header('User-Agent', f'AWS-Lambda-EmailProcessor/2.0-{request_id}')
+            req.add_header('X-Request-ID', request_id)
+            
+            # SSL-Kontext
+            ssl_context = ssl._create_unverified_context() if DEBUG_MODE else None
+            
+            # API-Request mit Timeout
+            timeout = 25  # Lambda hat 30s Timeout, also etwas weniger
+            
+            if DEBUG_MODE and ssl_context:
+                with urllib.request.urlopen(req, context=ssl_context, timeout=timeout) as response:
+                    response_body = response.read().decode('utf-8')
+                    response_code = response.getcode()
+            else:
+                with urllib.request.urlopen(req, timeout=timeout) as response:
+                    response_body = response.read().decode('utf-8')
+                    response_code = response.getcode()
+            
+            # Erfolgreiche Antwort
+            if response_code == 200:
+                logger.info(f"[{request_id}] API-Erfolg nach Versuch {attempt + 1}")
+                if DEBUG_MODE:
+                    logger.info(f"[{request_id}] API-Antwort: {response_body}")
+                return True
+            else:
+                logger.warning(f"[{request_id}] API-Antwort {response_code}: {response_body}")
+                
+        except urllib.error.HTTPError as e:
+            error_body = ""
+            try:
+                error_body = e.read().decode('utf-8')
+            except:
+                pass
+                
+            logger.error(f"[{request_id}] HTTP-Fehler {e.code} (Versuch {attempt + 1}): {e.reason}")
+            logger.error(f"[{request_id}] Fehlerdetails: {error_body}")
+            
+            # Bei 4xx-Fehlern nicht retry (Client-Fehler)
+            if 400 <= e.code < 500:
+                logger.error(f"[{request_id}] Client-Fehler - kein Retry")
+                return False
+                
+        except Exception as e:
+            logger.error(f"[{request_id}] Netzwerk-Fehler (Versuch {attempt + 1}): {str(e)}")
+            
+        # Warten vor nächstem Versuch (exponential backoff)
+        if attempt < max_retries - 1:
+            wait_time = 2 ** attempt  # 1s, 2s, 4s
+            logger.info(f"[{request_id}] Warte {wait_time}s vor nächstem Versuch")
+            time.sleep(wait_time)
+    
+    logger.error(f"[{request_id}] API-Aufruf nach {max_retries} Versuchen fehlgeschlagen")
+    return False
+
+def mark_large_email(s3_client, bucket, key, size):
+    """Markiert große E-Mails mit Metadaten statt sie zu löschen"""
+    try:
+        s3_client.copy_object(
+            Bucket=bucket,
+            Key=key,
+            CopySource={'Bucket': bucket, 'Key': key},
+            Metadata={
+                'status': 'too_large',
+                'size': str(size),
+                'marked_at': str(int(time.time()))
+            },
+            MetadataDirective='REPLACE'
+        )
+        logger.info(f"E-Mail als zu groß markiert: {key} ({size} Bytes)")
+    except Exception as e:
+        logger.error(f"Konnte E-Mail nicht markieren: {str(e)}")
\ No newline at end of file
diff --git a/ses-lambda/lambda_funtion_old.py b/ses-lambda/lambda_funtion_old.py
new file mode 100644
index 0000000..6073c2e
--- /dev/null
+++ b/ses-lambda/lambda_funtion_old.py
@@ -0,0 +1,202 @@
+# Optimiertes Lambda mit Verbesserungen
+import json
+import os
+import urllib.request
+import urllib.error
+import urllib.parse
+import logging
+import ssl
+import boto3
+import base64
+import hashlib
+
+# Konfiguration
+API_BASE_URL = os.environ['API_BASE_URL']
+API_TOKEN = os.environ['API_TOKEN']
+DEBUG_MODE = os.environ.get('DEBUG_MODE', 'false').lower() == 'true'
+MAX_EMAIL_SIZE = int(os.environ.get('MAX_EMAIL_SIZE', '10485760'))  # 10MB Standard
+
+# Bucket zu Domain Mapping
+BUCKET_DOMAIN_MAP = {
+    'bizmatch-ses-mails': 'bizmatch.net',
+    'haiky-app-emails-339712845857': 'haiky.app',
+    'andreasknuth-de-emails': 'andreasknuth.de',
+    'wetter-playadelingles-de-emails': 'wetter-playadelingles.de',
+}
+
+logger = logging.getLogger()
+logger.setLevel(logging.INFO)
+
+def lambda_handler(event, context):
+    """Optimierter Lambda-Handler mit verbesserter Fehlerbehandlung"""
+    
+    # Eindeutige Request-ID für Tracking
+    request_id = context.aws_request_id
+    logger.info(f"[{request_id}] S3-Ereignis empfangen")
+    
+    try:
+        # S3-Event-Details extrahieren
+        s3_event = event['Records'][0]['s3']
+        bucket_name = s3_event['bucket']['name']
+        object_key = urllib.parse.unquote_plus(s3_event['object']['key'])
+        
+        logger.info(f"[{request_id}] Verarbeite: {bucket_name}/{object_key}")
+        
+        # Domain ermitteln
+        domain = BUCKET_DOMAIN_MAP.get(bucket_name)
+        if not domain:
+            logger.warning(f"[{request_id}] Keine Domain-Zuordnung für Bucket {bucket_name}")
+            return {'statusCode': 400, 'body': json.dumps('Unbekannter Bucket')}
+        
+        # Duplikat-Check mit S3-ETag
+        s3_client = boto3.client('s3')
+        head_response = s3_client.head_object(Bucket=bucket_name, Key=object_key)
+        etag = head_response['ETag'].strip('"')
+        content_length = head_response['ContentLength']
+        
+        # E-Mail-Größe prüfen
+        if content_length > MAX_EMAIL_SIZE:
+            logger.warning(f"[{request_id}] E-Mail zu groß: {content_length} Bytes (max: {MAX_EMAIL_SIZE})")
+            # Große E-Mails markieren statt löschen
+            mark_large_email(s3_client, bucket_name, object_key, content_length)
+            return {'statusCode': 413, 'body': json.dumps('E-Mail zu groß')}
+        
+        # E-Mail laden
+        try:
+            response = s3_client.get_object(Bucket=bucket_name, Key=object_key)
+            email_content = response['Body'].read()
+            logger.info(f"[{request_id}] E-Mail geladen: {len(email_content)} Bytes")
+            
+        except Exception as e:
+            logger.error(f"[{request_id}] Fehler beim Laden der E-Mail: {str(e)}")
+            return {'statusCode': 500, 'body': json.dumps(f'S3-Fehler: {str(e)}')}
+        
+        # E-Mail-Content komprimieren für Übertragung (optional)
+        import gzip
+        compressed_content = gzip.compress(email_content)
+        email_base64 = base64.b64encode(compressed_content).decode('utf-8')
+        
+        # Payload erstellen
+        payload = {
+            'bucket': bucket_name,
+            'key': object_key,
+            'domain': domain,
+            'email_content': email_base64,
+            'compressed': True,  # Flag für API
+            'etag': etag,
+            'request_id': request_id,
+            'original_size': len(email_content),
+            'compressed_size': len(compressed_content)
+        }
+        
+        # API aufrufen mit Retry-Logik
+        success = call_api_with_retry(payload, domain, request_id)
+        
+        if success:
+            # Bei Erfolg: E-Mail aus S3 löschen
+            try:
+                s3_client.delete_object(Bucket=bucket_name, Key=object_key)
+                logger.info(f"[{request_id}] E-Mail erfolgreich verarbeitet und gelöscht")
+                return {
+                    'statusCode': 200,
+                    'body': json.dumps({
+                        'message': 'E-Mail erfolgreich verarbeitet',
+                        'request_id': request_id
+                    })
+                }
+            except Exception as e:
+                logger.error(f"[{request_id}] Konnte E-Mail nicht löschen: {str(e)}")
+                # Trotzdem Erfolg melden, da E-Mail verarbeitet wurde
+                return {'statusCode': 200, 'body': json.dumps('Verarbeitet, aber nicht gelöscht')}
+        else:
+            # Bei Fehler: E-Mail in S3 belassen für späteren Retry
+            return {'statusCode': 500, 'body': json.dumps('API-Fehler')}
+            
+    except Exception as e:
+        logger.error(f"[{request_id}] Unerwarteter Fehler: {str(e)}", exc_info=True)
+        return {'statusCode': 500, 'body': json.dumps(f'Lambda-Fehler: {str(e)}')}
+
+def call_api_with_retry(payload, domain, request_id, max_retries=3):
+    """API-Aufruf mit Retry-Logik"""
+    
+    sync_url = f"{API_BASE_URL}/process/{domain}"
+    payload_json = json.dumps(payload).encode('utf-8')
+    
+    for attempt in range(max_retries):
+        logger.info(f"[{request_id}] API-Aufruf Versuch {attempt + 1}/{max_retries}")
+        
+        try:
+            # Request erstellen
+            req = urllib.request.Request(sync_url, data=payload_json, method="POST")
+            req.add_header('Authorization', f'Bearer {API_TOKEN}')
+            req.add_header('Content-Type', 'application/json')
+            req.add_header('User-Agent', f'AWS-Lambda-EmailProcessor/2.0-{request_id}')
+            req.add_header('X-Request-ID', request_id)
+            
+            # SSL-Kontext
+            ssl_context = ssl._create_unverified_context() if DEBUG_MODE else None
+            
+            # API-Request mit Timeout
+            timeout = 25  # Lambda hat 30s Timeout, also etwas weniger
+            
+            if DEBUG_MODE and ssl_context:
+                with urllib.request.urlopen(req, context=ssl_context, timeout=timeout) as response:
+                    response_body = response.read().decode('utf-8')
+                    response_code = response.getcode()
+            else:
+                with urllib.request.urlopen(req, timeout=timeout) as response:
+                    response_body = response.read().decode('utf-8')
+                    response_code = response.getcode()
+            
+            # Erfolgreiche Antwort
+            if response_code == 200:
+                logger.info(f"[{request_id}] API-Erfolg nach Versuch {attempt + 1}")
+                return True
+            else:
+                logger.warning(f"[{request_id}] API-Antwort {response_code}: {response_body}")
+                
+        except urllib.error.HTTPError as e:
+            error_body = ""
+            try:
+                error_body = e.read().decode('utf-8')
+            except:
+                pass
+                
+            logger.error(f"[{request_id}] HTTP-Fehler {e.code} (Versuch {attempt + 1}): {e.reason}")
+            logger.error(f"[{request_id}] Fehlerdetails: {error_body}")
+            
+            # Bei 4xx-Fehlern nicht retry (Client-Fehler)
+            if 400 <= e.code < 500:
+                logger.error(f"[{request_id}] Client-Fehler - kein Retry")
+                return False
+                
+        except Exception as e:
+            logger.error(f"[{request_id}] Netzwerk-Fehler (Versuch {attempt + 1}): {str(e)}")
+            
+        # Warten vor nächstem Versuch (exponential backoff)
+        if attempt < max_retries - 1:
+            wait_time = 2 ** attempt  # 1s, 2s, 4s
+            logger.info(f"[{request_id}] Warte {wait_time}s vor nächstem Versuch")
+            import time
+            time.sleep(wait_time)
+    
+    logger.error(f"[{request_id}] API-Aufruf nach {max_retries} Versuchen fehlgeschlagen")
+    return False
+
+def mark_large_email(s3_client, bucket, key, size):
+    """Markiert große E-Mails mit Metadaten statt sie zu löschen"""
+    try:
+        s3_client.copy_object(
+            Bucket=bucket,
+            Key=key,
+            CopySource={'Bucket': bucket, 'Key': key},
+            Metadata={
+                'status': 'too_large',
+                'size': str(size),
+                'marked_at': str(int(time.time()))
+            },
+            MetadataDirective='REPLACE'
+        )
+        logger.info(f"E-Mail als zu groß markiert: {key} ({size} Bytes)")
+    except Exception as e:
+        logger.error(f"Konnte E-Mail nicht markieren: {str(e)}")
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