diff --git a/module.nix b/module.nix
index 47e9d35..1c7b34a 100644
--- a/module.nix
+++ b/module.nix
@@ -89,7 +89,7 @@ in
         "SMTP_ENABLE_STARTTLS" = "never";
         # "SMTP_ENABLE_STARTTLS_AUTO" = "false";
         # "SMTP_ENABLE_STARTTLS" = "always";
-        "SMTP_TLS" = "false";
+        "SMTP_TLS" = "true";
         "SMTP_SSL" = "true";
       };
     };