diff --git a/cgi-bin/form.py b/cgi-bin/form.py
index 6098fe4..1784302 100755
--- a/cgi-bin/form.py
+++ b/cgi-bin/form.py
@@ -340,7 +340,7 @@ try:
 	response = session.post(
 		urljoin(ZAMMAD_URL, "api/v1/tickets"),
 		headers={
-			"X-On-Behalf-Of": contact_email,
+			"From": contact_email,
 		},
 		json=dict(
 			title=f"Kontaktformular {contact_name} – {form_name}",