diff --git a/email_api/email_api/app.py b/email_api/email_api/app.py
index 098dc28..84b045a 100644
--- a/email_api/email_api/app.py
+++ b/email_api/email_api/app.py
@@ -229,12 +229,9 @@ def retry_domain_emails(domain):
                 if not recipients:
                     raise ValueError(f"Keine Empfänger in E-Mail {key} gefunden")
                 
-                # An SMTP weiterleiten
+                # An SMTP weiterleiten - verwende sendmail() 
                 with smtplib.SMTP(SMTP_HOST, SMTP_PORT) as smtp:
-                    smtp.mail(from_addr)
-                    for recipient in recipients:
-                        smtp.rcpt(recipient)
-                    smtp.data(email_content)
+                    smtp.sendmail(from_addr, recipients, email_content)
                 
                 # Als verarbeitet markieren
                 mark_email_as_processed(bucket_name, key)
@@ -332,12 +329,9 @@ def process_email(domain):
 
         logger.info(f"[{request_id}] From: {from_addr}, Recipients: {recipients}")
 
-        # An Postfix weiterleiten - für jeden Empfänger einzeln
+        # An Postfix weiterleiten - verwende sendmail() statt manueller SMTP-Befehle
         with smtplib.SMTP(SMTP_HOST, SMTP_PORT) as smtp:
-            smtp.mail(from_addr)
-            for recipient in recipients:
-                smtp.rcpt(recipient)
-            smtp.data(email_content)
+            smtp.sendmail(from_addr, recipients, email_content)
             
         logger.info(f"[{request_id}] Email forwarded to Postfix for {domain} - {len(recipients)} recipients")