diff --git a/nix/os/containers/mailserver.nix b/nix/os/containers/mailserver.nix
index 44842f0..0a322c2 100644
--- a/nix/os/containers/mailserver.nix
+++ b/nix/os/containers/mailserver.nix
@@ -41,6 +41,10 @@ in args // {
           args = scheme=CRYPT username_format=%u /etc/dovecot/users
         }
 
+        protocol lda {
+          postmaster_address = "mail@stefanjunker.de"
+          mail_plugins = $mail_plugins sieve
+        }
       '';
 
     };