diff --git a/flake.nix b/flake.nix
index 22856db..374f41a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -43,6 +43,10 @@
       url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-24.05";
       inputs.nixpkgs.follows = "nixpkgs"; # use the same nixpkgs as the system
     };
+    sortseer = {
+      url = "git+https://git.caspervk.net/caspervk/sortseer.git";
+      inputs.nixpkgs.follows = "nixpkgs"; # use the same nixpkgs as the system
+    };
   };
 
   outputs = {
diff --git a/hosts/alpha/default.nix b/hosts/alpha/default.nix
index d014791..2976ff7 100644
--- a/hosts/alpha/default.nix
+++ b/hosts/alpha/default.nix
@@ -9,6 +9,7 @@
     ./knot-dns.nix
     ./mumble.nix
     ./network.nix
+    ./sortseer.nix
   ];
 
   networking.hostName = "alpha";
diff --git a/hosts/alpha/network.nix b/hosts/alpha/network.nix
index 0c16ef8..d837d4a 100644
--- a/hosts/alpha/network.nix
+++ b/hosts/alpha/network.nix
@@ -91,9 +91,6 @@
   };
 
   networking = {
-    firewall.allowedTCPPorts = [
-      25 # @sortseer.dk
-    ];
     firewall.allowedUDPPorts = [
       51820 # wg-sigma-public
       51821 # wg-sigma-p2p
diff --git a/hosts/alpha/sortseer.nix b/hosts/alpha/sortseer.nix
new file mode 100644
index 0000000..fa05540
--- /dev/null
+++ b/hosts/alpha/sortseer.nix
@@ -0,0 +1,12 @@
+{sortseer, ...}: {
+  imports = [
+    sortseer.nixosModules.default
+  ];
+
+  # https://git.caspervk.net/caspervk/sortseer
+  services.sortseer.enable = true;
+
+  networking.firewall = {
+    allowedTCPPorts = [25];
+  };
+}