email box empty styling

backend/app/services/mail_sender.py

@@ -76,6 +76,7 @@ async def send_via_smtp(
         recipients=recipients,
         hostname=settings.smtp_host,
         port=settings.smtp_port,
+        local_hostname=settings.smtp_client_hostname,
         username=settings.smtp_username or None,
         password=settings.smtp_password or None,
         start_tls=settings.smtp_use_tls,