diff --git a/mail-server.nix b/mail-server.nix
index 289ce5c..a6f7f09 100644
--- a/mail-server.nix
+++ b/mail-server.nix
@@ -26,4 +26,5 @@ let
   mail_user = map accountsToUser login_accounts;
 in
 {
+  networking.hostName = host_prefix + "." + domain;
 }