diff --git a/index.js b/index.js
index 11b7f7d..29579d5 100644
--- a/index.js
+++ b/index.js
@@ -6,6 +6,7 @@ import { execa } from "execa";
 
 dotenv.config();
 
+const HOST = process.env.HOST || "127.0.0.1";
 const PORT = process.env.PORT || 3000;
 const CONTAINER = process.env.CONTAINER || "mailserver";
 const INVITE_CODE = process.env.INVITE_CODE;
@@ -66,4 +67,4 @@ app.post("/register", async (req, res) => {
   }
 });
 
-app.listen(PORT);
+app.listen(PORT, HOST);