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vendor/symfony/mime/DraftEmail.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Mime;
+
+use Symfony\Component\Mime\Header\Headers;
+use Symfony\Component\Mime\Part\AbstractPart;
+
+/**
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+class DraftEmail extends Email
+{
+    public function __construct(?Headers $headers = null, ?AbstractPart $body = null)
+    {
+        parent::__construct($headers, $body);
+
+        $this->getHeaders()->addTextHeader('X-Unsent', '1');
+    }
+
+    /**
+     * Override default behavior as draft emails do not require From/Sender/Date/Message-ID headers.
+     * These are added by the client that actually sends the email.
+     */
+    public function getPreparedHeaders(): Headers
+    {
+        $headers = clone $this->getHeaders();
+
+        if (!$headers->has('MIME-Version')) {
+            $headers->addTextHeader('MIME-Version', '1.0');
+        }
+
+        $headers->remove('Bcc');
+
+        return $headers;
+    }
+}