diff --git a/index.php b/index.php
index ba03de4..7f8e8e9 100644
--- a/index.php
+++ b/index.php
@@ -17,39 +17,7 @@ function containsHeaderInjection(string $value): bool
     return (bool) preg_match('/[\r\n]/', $value);
 }
 
-// --- Send email via AgentMail API ---
-function sendContactEmail(string $subject, string $body, string $replyToEmail, string $replyToName): bool
-{
-    $apiKey = getenv('AGENTMAIL_API_KEY') ?: '';
-    if ($apiKey === '') {
-        return false;
-    }
 
-    $apiUrl = 'https://api.agentmail.to/v0/inboxes/max-kies-media-ai-assistent@agentmail.to/messages/send';
-    $payload = json_encode([
-        'to'         => ['mki@kies-media.de'],
-        'subject'    => $subject,
-        'text'       => $body,
-        'reply_to'   => $replyToEmail,
-    ]);
-
-    $ch = curl_init($apiUrl);
-    curl_setopt_array($ch, [
-        CURLOPT_POST           => true,
-        CURLOPT_POSTFIELDS     => $payload,
-        CURLOPT_RETURNTRANSFER => true,
-        CURLOPT_TIMEOUT        => 10,
-        CURLOPT_HTTPHEADER     => [
-            'Authorization: Bearer ' . $apiKey,
-            'Content-Type: application/json',
-        ],
-    ]);
-    $response = curl_exec($ch);
-    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
-    curl_close($ch);
-
-    return $httpCode >= 200 && $httpCode < 300;
-}
 
 // --- Form processing ---
 $formErrors = [];
@@ -103,8 +71,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $formErrors[] = 'Bitte warten Sie einen Moment vor der nächsten Anfrage.';
         }
 
-        // Send email via AgentMail API if no errors
+        // Send email if no errors
         if (empty($formErrors)) {
+            $to      = 'mki@kies-media.de';
             $subject = 'Kontaktanfrage: ' . $formData['interest'];
             $body    = "Von: {$formData['fname']} {$formData['lname']}\n"
                      . "E-Mail: {$formData['email']}\n";
@@ -114,7 +83,12 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $body .= "Anliegen: {$formData['interest']}\n\n"
                      . $formData['message'];
 
-            $mailSent = sendContactEmail($subject, $body, $formData['email'], $formData['fname'] . ' ' . $formData['lname']);
+            $headers  = "From: {$formData['email']}\r\n";
+            $headers .= "Reply-To: {$formData['email']}\r\n";
+            $headers .= "Content-Type: text/plain; charset=UTF-8\r\n";
+            $headers .= "X-Mailer: PHP/" . phpversion();
+
+            $mailSent = mail($to, $subject, $body, $headers);
 
             if ($mailSent) {
                 $formSuccess = true;