diff --git a/nixos/machines/hera/mail.nix b/nixos/machines/hera/mail.nix
index 43b2ef73..b96afcd3 100644
--- a/nixos/machines/hera/mail.nix
+++ b/nixos/machines/hera/mail.nix
@@ -32,7 +32,7 @@ in
             web.de
             google.com
             meteosafe.com # Wetterwarnungen
-            tu-darmstadt.de
+            # tu-darmstadt.de # Not safe because of spam via cda
             ccc.de
             discourse.cloud
             haskell.org