diff --git a/hosts/sid/services/mailserver.nix b/hosts/sid/services/mailserver.nix
index caa2b9f..bd6e73f 100644
--- a/hosts/sid/services/mailserver.nix
+++ b/hosts/sid/services/mailserver.nix
@@ -6,6 +6,7 @@
   mailserver = {
     enable = true;
     stateVersion = 3;
+    localDnsResolver = false; # use coredns
     accounts = {
       sid = {
         aliases = [ "postmaster" ];