Add SMTP auth support and fix defaults (host.docker.internal, port 587)

app.js

@@ -6,9 +6,11 @@ const {
   AMQP_EXCHANGE,
   AMQP_QUEUE = "email-forwarder",
   SMTP_HOST,
-  SMTP_PORT = "25",
+  SMTP_PORT = "587",
+  SMTP_USER,
+  SMTP_PASSWORD,
   NOTIFY_TO,
-  NOTIFY_FROM = "hal@novox.be",
+  NOTIFY_FROM,
 } = process.env;
 
 async function main() {
@@ -20,15 +22,19 @@ async function main() {
   await ch.bindQueue(AMQP_QUEUE, AMQP_EXCHANGE, "");
   console.log(`Bound queue '${AMQP_QUEUE}' to exchange '${AMQP_EXCHANGE}'`);
 
-  const transport = nodemailer.createTransport({
+  const transportOpts = {
     host: SMTP_HOST,
     port: parseInt(SMTP_PORT),
     secure: false,
     tls: { rejectUnauthorized: false },
-  });
+  };
+  if (SMTP_USER && SMTP_PASSWORD) {
+    transportOpts.auth = { user: SMTP_USER, pass: SMTP_PASSWORD };
+  }
+  const transport = nodemailer.createTransport(transportOpts);
 
-  console.log(`SMTP: ${SMTP_HOST}:${SMTP_PORT}`);
-  console.log(`Forwarding to: ${NOTIFY_TO}`);
+  console.log(`SMTP: ${SMTP_USER || "(no auth)"}@${SMTP_HOST}:${SMTP_PORT}`);
+  console.log(`From: ${NOTIFY_FROM} → To: ${NOTIFY_TO}`);
   console.log("Waiting for messages...\n");
 
   ch.consume(AMQP_QUEUE, async (msg) => {