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vendor/symfony/mailer/Transport/TransportInterface.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\Mailer\Transport;
+
+use Symfony\Component\Mailer\Envelope;
+use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
+use Symfony\Component\Mailer\SentMessage;
+use Symfony\Component\Mime\RawMessage;
+
+/**
+ * Interface for all mailer transports.
+ *
+ * When sending emails, you should prefer MailerInterface implementations
+ * as they allow asynchronous sending.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface TransportInterface extends \Stringable
+{
+    /**
+     * @throws TransportExceptionInterface
+     */
+    public function send(RawMessage $message, ?Envelope $envelope = null): ?SentMessage;
+}