diff --git a/nix-system-configs/modules/system/mail-server.nix b/nix-system-configs/modules/system/mail-server.nix
index 0b18ed0..eb52020 100644
--- a/nix-system-configs/modules/system/mail-server.nix
+++ b/nix-system-configs/modules/system/mail-server.nix
@@ -80,7 +80,7 @@ in {
       openFirewall = true;
       settings = {
         server = {
-          hostname = "mail.prg-radio.org";
+          hostname = "mailserver.prg-radio.org";
           tls = {
             enable = true;
             implicit = true;
@@ -112,7 +112,7 @@ in {
           };
         };
         lookup.default = {
-          hostname = "mail.prg-radio.org";
+          hostname = "mailserver.prg-radio.org";
           domain = "prg-radio.org";
         };
            acme."letsencrypt" = {
@@ -120,7 +120,7 @@ in {
             challenge = "dns-01";
            # reference the contact and secret via files under /etc/stalwart
             contact = "%{file:/etc/stalwart/cloudflare-username}%";
-           domains = ["prg-radio.org" "mail.prg-radio.org"];
+           domains = ["prg-radio.org" "mailserver.prg-radio.org" "mail.prg-radio.org"];
            provider = "cloudflare";
            secret = "%{file:/etc/stalwart/acme-secret}%";
         };