diff --git a/public/admin/index.html b/public/admin/index.html
index 72cb25d..e5b42f7 100644
--- a/public/admin/index.html
+++ b/public/admin/index.html
@@ -379,6 +379,12 @@
             <div><label>Absender (From)</label><input name="smtp_from" placeholder="noreply@firma.de" /></div>
           </div>
           <div class="field" style="margin-top:.75rem">
+            <label style="display:flex; align-items:center; gap:.4rem">
+              <input type="checkbox" name="smtp_notify_customer" style="width:auto" />
+              Kunden nach Upload eine Bestätigungsmail schicken (nur wenn E-Mail beim Kunden hinterlegt)
+            </label>
+          </div>
+          <div class="field" style="margin-top:.5rem">
             <label style="display:flex; align-items:center; gap:.4rem">
               <input type="checkbox" name="smtp_notify_admin" style="width:auto" />
               Admins bei jedem Upload benachrichtigen (alle Admins mit E-Mail-Adresse)
@@ -765,6 +771,7 @@ async function loadSettings() {
     ? 'gesetzt — leer = unverändert lassen'
     : 'nicht gesetzt';
   sf.smtp_notify_admin.checked = !!s.smtp_notify_admin;
+  sf.smtp_notify_customer.checked = s.smtp_notify_customer !== false;
 }
 function setSlider(id, val) {
   document.getElementById(id).value = val;
@@ -819,6 +826,7 @@ document.getElementById('smtpForm').addEventListener('submit', async (e) => {
     smtp_user: fd.get('smtp_user') || '',
     smtp_from: fd.get('smtp_from') || '',
     smtp_notify_admin: !!fd.get('smtp_notify_admin'),
+    smtp_notify_customer: !!fd.get('smtp_notify_customer'),
   };
   const pw = fd.get('smtp_pass');
   if (pw) body.smtp_pass = pw;
diff --git a/src/server.js b/src/server.js
index 7b39e68..c1cc011 100644
--- a/src/server.js
+++ b/src/server.js
@@ -272,6 +272,7 @@ api.get('/settings', auth.requireAdmin, (req, res) => {
     smtp_pass_set: !!settings.get('smtp_pass', ''),
     smtp_from: settings.get('smtp_from', ''),
     smtp_notify_admin: settings.get('smtp_notify_admin', 'false') === 'true',
+    smtp_notify_customer: settings.get('smtp_notify_customer', 'true') === 'true',
   });
 });
 
@@ -301,6 +302,8 @@ api.put('/settings', auth.requireAdmin, (req, res) => {
   if (b.smtp_from !== undefined)  settings.set('smtp_from', String(b.smtp_from || '').trim());
   if (b.smtp_notify_admin !== undefined)
     settings.set('smtp_notify_admin', b.smtp_notify_admin ? 'true' : 'false');
+  if (b.smtp_notify_customer !== undefined)
+    settings.set('smtp_notify_customer', b.smtp_notify_customer ? 'true' : 'false');
   res.json({ ok: true });
 });
 
diff --git a/src/upload-notifier.js b/src/upload-notifier.js
index 3a59560..438e89d 100644
--- a/src/upload-notifier.js
+++ b/src/upload-notifier.js
@@ -15,7 +15,8 @@ function fmtSize(n) {
 
 function recipientsFor(customer) {
   const out = [];
-  if (customer.email) out.push({ kind: 'customer', to: customer.email });
+  const notifyCustomer = settings.get('smtp_notify_customer', 'true') === 'true';
+  if (notifyCustomer && customer.email) out.push({ kind: 'customer', to: customer.email });
 
   // Staff assigned to this customer (with email)
   const staff = db.prepare(`