diff --git a/Web/modules/emailservice/email.py b/Web/modules/emailservice/email.py
index f23bdb8..0d7fa6f 100644
--- a/Web/modules/emailservice/email.py
+++ b/Web/modules/emailservice/email.py
@@ -12,9 +12,12 @@ logger = logging.getLogger(__name__)
 
 
 def _build_smtp_client():
+    if not cfg.EMAIL_SMTP_HOST:
+        raise RuntimeError('EMAIL_SMTP_HOST ist nicht konfiguriert')
+
     smtp = smtplib.SMTP(
-        "mail.invario-software.de",
-        587,
+        cfg.EMAIL_SMTP_HOST,
+        cfg.EMAIL_SMTP_PORT,
         timeout=cfg.EMAIL_TIMEOUT_SECONDS,
     )
     smtp.ehlo()