diff --git a/mail-server/rmilter.nix b/mail-server/rmilter.nix
index 1f30ede..113dc98 100644
--- a/mail-server/rmilter.nix
+++ b/mail-server/rmilter.nix
@@ -51,6 +51,9 @@ in
       rspamd.enable = true;
       extraConfig =
       ''
+      use_redis = true;
+      max_size = 20M;
+
       ${clamav}
 
       ${dkim}