diff --git a/hosts/sid/services/mailserver.nix b/hosts/sid/services/mailserver.nix
index bd6e73f..f3af274 100644
--- a/hosts/sid/services/mailserver.nix
+++ b/hosts/sid/services/mailserver.nix
@@ -1,4 +1,4 @@
-{ inputs, ... }:
+{ inputs, config, ... }:
 
 {
   imports = [ inputs.synix.nixosModules.mailserver ];
@@ -6,7 +6,7 @@
   mailserver = {
     enable = true;
     stateVersion = 3;
-    localDnsResolver = false; # use coredns
+    localDnsResolver = !config.services.coredns.enable;
     accounts = {
       sid = {
         aliases = [ "postmaster" ];
diff --git a/modules/nixos/tailscale/default.nix b/modules/nixos/tailscale/default.nix
index 26acd6e..726461d 100644
--- a/modules/nixos/tailscale/default.nix
+++ b/modules/nixos/tailscale/default.nix
@@ -1,4 +1,4 @@
-{ inputs, ... }:
+{ inputs, config, ... }:
 
 {
   imports = [ inputs.synix.nixosModules.tailscale ];
@@ -6,6 +6,7 @@
   services.tailscale = {
     enable = true;
     enableSSH = true;
+    acceptDNS = !config.services.coredns.enable;
     loginServer = "https://hs.sid.ovh";
   };
 }