diff --git a/nixos/modules/services/mail/mlmmj.nix b/nixos/modules/services/mail/mlmmj.nix
index 5843a6745f58..08ed4d232a18 100644
--- a/nixos/modules/services/mail/mlmmj.nix
+++ b/nixos/modules/services/mail/mlmmj.nix
@@ -96,8 +96,9 @@ in
       extraAliases = concatMapStrings (alias cfg.listDomain) cfg.mailLists;
 
       extraConfig = ''
-        transport = hash:${stateDir}/transports
-        virtual = hash:${stateDir}/virtuals
+        transport_maps = hash:${stateDir}/transports
+        virtual_alias_maps = hash:${stateDir}/virtuals
+        propagate_unmatched_extensions = virtual
       '';
     };