diff --git a/hosts/mail/default.nix b/hosts/mail/default.nix
index 2c84f6d..605d3e9 100644
--- a/hosts/mail/default.nix
+++ b/hosts/mail/default.nix
@@ -159,7 +159,7 @@ in
           args = [ "-v" ];
         };
       };
-      config = {
+      settings.main = {
         unknown_local_recipient_reject_code = 550;
         relay_domains = [
           "hash:/var/lib/mailman/data/postfix_domains"