diff --git a/flake.nix b/flake.nix
index 1b42b2d..a8a5552 100644
--- a/flake.nix
+++ b/flake.nix
@@ -58,6 +58,7 @@
                       SECRET_KEY = file.readline()
             '';
             propagatedBuildInputs = with py.pkgs; [
+              aiosmtpd
               apprise
               cron-descriptor
               cronsim