diff --git a/backend/src/media_library_viewer_api/services/mailer.py b/backend/src/media_library_viewer_api/services/mailer.py
index c840e29..eee3d77 100644
--- a/backend/src/media_library_viewer_api/services/mailer.py
+++ b/backend/src/media_library_viewer_api/services/mailer.py
@@ -170,7 +170,7 @@ def _smtp_sender_not_authorized(error: Exception) -> bool:
 def _smtp_attempt_metadata(mode: dict[str, Any]) -> dict[str, Any]:
     transport = "SSL" if mode["use_ssl"] else "STARTTLS" if mode["use_tls"] else "plain SMTP"
     return {
-        "label": str(mode.get("mode_label") or f"{mode["smtp_host"]}:{mode["smtp_port"]}"),
+        "label": str(mode.get("mode_label") or f"{mode['smtp_host']}:{mode['smtp_port']}"),
         "smtp_host": str(mode["smtp_host"]),
         "smtp_port": int(mode["smtp_port"]),
         "use_tls": bool(mode["use_tls"]),