diff --git a/nixos/modules/services/mail/rmilter.nix b/nixos/modules/services/mail/rmilter.nix
index 7f38d757013..0d91b247cd3 100644
--- a/nixos/modules/services/mail/rmilter.nix
+++ b/nixos/modules/services/mail/rmilter.nix
@@ -89,7 +89,7 @@ in
 
       bindSocket.path = mkOption {
        type = types.str;
-       default = "/run/rmilter/rmilter.sock";
+       default = "/run/rmilter.sock";
        description = ''
           Path to Unix domain socket to listen on.
         '';
@@ -193,6 +193,9 @@ in
   config = mkMerge [
 
     (mkIf cfg.enable {
+      warnings = [
+        ''`config.services.rmilter' is deprecated, `rmilter' deprecated and unsupported by upstream, and will be removed from next releases. Use built-in rspamd milter instead.''
+      ];
 
       users.users = singleton {
         name = cfg.user;