diff --git a/configuration.nix b/configuration.nix
index bff22ef..c7a44c9 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -4,6 +4,7 @@
     ./misskey-service.nix
     ./heartles-xyz-proxy.nix
     ./ogdo.nix
+    ./postfix.nix
   ];
 
   nix.settings = {
diff --git a/postfix.nix b/postfix.nix
new file mode 100644
index 0000000..1818103
--- /dev/null
+++ b/postfix.nix
@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+{
+  services.postfix = {
+    enable = true;
+    enableSubmission = true;
+
+    extraConfig = ''
+      inet_interfaces = 127.0.0.1
+    '';
+  };
+}