diff --git a/server/config.js b/server/config.js
index fee536c..9763869 100644
--- a/server/config.js
+++ b/server/config.js
@@ -141,6 +141,8 @@ export const config = {
     user: process.env.SMTP_USERNAME || '',
     pass: process.env.SMTP_PASSWORD || '',
     from: process.env.SMTP_FROM || process.env.SMTP_USERNAME || '',
+    // Antworten auf Kundenmails landen hier statt im Versandpostfach (noreply@)
+    replyTo: process.env.SMTP_REPLY_TO || '',
   },
 
   chatNotify: {
diff --git a/server/services/mailer.js b/server/services/mailer.js
index 0445dce..41a219c 100644
--- a/server/services/mailer.js
+++ b/server/services/mailer.js
@@ -10,6 +10,8 @@ function getTransporter() {
       host: config.smtp.host,
       port: config.smtp.port,
       secure: config.smtp.secure,
+      // Port 587: ohne STARTTLS nicht senden (Hetzner erlaubt die Anmeldung auch unverschluesselt)
+      requireTLS: !config.smtp.secure,
       auth: { user: config.smtp.user, pass: config.smtp.pass },
     })
   }
@@ -37,7 +39,7 @@ export async function sendChatNotification(customer, text) {
 
     const name = customer.name || customer.email || 'Kunde'
     await mailer.sendMail({
-      from: `"Webklar Kundenportal" <${config.smtp.from}>`,
+      from: `"WEBklar Kundenbereich" <${config.smtp.from}>`,
       to: config.chatNotify.emails.join(', '),
       subject: `Neue Portalnachricht von ${name}`,
       text: [
@@ -65,7 +67,7 @@ export async function sendAdminNotice(subject, lines) {
     const mailer = getTransporter()
     if (!mailer || !config.chatNotify.emails.length) return { sent: false, reason: 'nicht konfiguriert' }
     await mailer.sendMail({
-      from: `"Webklar Kundenportal" <${config.smtp.from}>`,
+      from: `"WEBklar Kundenbereich" <${config.smtp.from}>`,
       to: config.chatNotify.emails.join(', '),
       subject: `[Abo] ${subject}`,
       text: lines.join('\n'),
@@ -86,7 +88,8 @@ export async function sendCustomerMail(to, subject, lines, attachments = []) {
   const mailer = getTransporter()
   if (!mailer) throw new Error('SMTP nicht konfiguriert')
   return mailer.sendMail({
-    from: `"Webklar" <${config.smtp.from}>`,
+    from: `"WEBklar" <${config.smtp.from}>`,
+    replyTo: config.smtp.replyTo || undefined,
     to,
     bcc: config.chatNotify.emails.join(', ') || undefined,
     subject,