diff --git a/email_api/email_api/app.py b/email_api/email_api/app.py
index e58bbfd..8af1c4f 100644
--- a/email_api/email_api/app.py
+++ b/email_api/email_api/app.py
@@ -52,6 +52,8 @@ def mark_email_as_processed(bucket, key):
 
 @app.route('/process/<domain>', methods=['POST'])
 def process_email(domain):
+    logger.info(f"[{request_id}] INCOMING POST /process/{domain}: "
+                f"payload_keys={list(data.keys())}")    
     auth = request.headers.get('Authorization')
     if auth != f'Bearer {API_TOKEN}':
         return jsonify({'error': 'Unauthorized'}), 401
@@ -67,6 +69,7 @@ def process_email(domain):
 
     msg = BytesParser(policy=default).parsebytes(email_bytes)
     from_addr = getaddresses(msg.get_all('from', []))[0][1] if msg.get_all('from') else f'lambda@{domain}'
+    logger.debug(f"[{request_id}] Parsed email: from={from_addr}, recipients={recipients}")    
     recipients = []
     for hdr in ('to', 'cc', 'bcc'):
         recipients += [addr for _n, addr in getaddresses(msg.get_all(hdr, []))]
@@ -94,7 +97,9 @@ def retry_domain_emails(domain):
             head = s3_client.head_object(Bucket=bucket, Key=obj['Key'])
             if head.get('Metadata', {}).get('processed') != 'true':
                 unprocessed.append(obj['Key'])
-
+    
+    logger.info(f"[{request_id}] RETRY processing for domain={domain}, keys={unprocessed}")
+    
     results = {'processed': [], 'failed': []}
     for key in unprocessed:
         try:
diff --git a/ses-lambda/lambda-function.py b/ses-lambda/lambda-function.py
index cf4276c..c685446 100644
--- a/ses-lambda/lambda-function.py
+++ b/ses-lambda/lambda-function.py
@@ -55,6 +55,7 @@ def call_api_with_retry(payload, domain, request_id, max_retries=3):
     payload_json = json.dumps(payload).encode('utf-8')
     for attempt in range(max_retries):
         try:
+            logger.info(f"[{request_id}] Attempt {attempt+1}: POST payload to {sync_url}")
             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')
@@ -65,6 +66,7 @@ def call_api_with_retry(payload, domain, request_id, max_retries=3):
             with urllib.request.urlopen(req, timeout=timeout, context=context) as response:
                 code = response.getcode()
             if code == 200:
+                logger.info(f"[{request_id}] API response: {response_code}")
                 return True
         except urllib.error.HTTPError as e:
             if 400 <= e.code < 500:
@@ -113,6 +115,10 @@ def lambda_handler(event, context):
         'original_size': len(body),
         'compressed_size': len(compressed)
     }
+    
+    logger.info(f"[{request_id}] OUTGOING payload to {API_BASE_URL}/process/{domain}: "
+                f"domain={domain}, key={key}, bucket={bucket}, "
+                f"orig_size={len(body)}, comp_size={len(compressed)}")
 
     if call_api_with_retry(payload, domain, request_id):
         # Inline metadata marking statt Löschung