From decad8165f1e8ae6c724d6faa9a3423b96d93dc5 Mon Sep 17 00:00:00 2001
From: Kerim Atilgan <kerim@familie-atilgan.de>
Date: Fri, 3 Jul 2026 15:47:20 +0200
Subject: [PATCH] SMTP-Fix: IPv4 bevorzugen (Container ohne IPv6 ->
 Strato-Timeout) + kurze Timeouts

---
 server.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/server.js b/server.js
index e5e119d..8889d4a 100644
--- a/server.js
+++ b/server.js
@@ -7,6 +7,11 @@ import express from 'express';
 import cors from 'cors';
 import rateLimit from 'express-rate-limit';
 import nodemailer from 'nodemailer';
+import dns from 'node:dns';
+
+// Container haben oft keine IPv6-Route. Strato (smtp.strato.de) löst sonst auf
+// eine IPv6-Adresse auf -> SMTP-Verbindung läuft in den Timeout. IPv4 bevorzugen:
+dns.setDefaultResultOrder('ipv4first');
 
 const {
   PORT = 3000,
@@ -53,6 +58,9 @@ const transporter = nodemailer.createTransport({
   port: Number(SMTP_PORT),
   secure: String(SMTP_SECURE) === 'true',
   auth: SMTP_USER ? { user: SMTP_USER, pass: SMTP_PASS } : undefined,
+  connectionTimeout: 10000, // schnell abbrechen statt hängen
+  greetingTimeout: 10000,
+  socketTimeout: 15000,
 });
 
 const isEmail = (v) => /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(v || '');