diff --git a/mail-server/rspamd.nix b/mail-server/rspamd.nix
index bf2caa3..a5df196 100644
--- a/mail-server/rspamd.nix
+++ b/mail-server/rspamd.nix
@@ -126,6 +126,7 @@ in
       locals = {
         "milter_headers.conf" = {
           text = ''
+            use = [ "authentication-results" ];
             extended_spam_headers = true;
           '';
         };