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    <h3>Editing: MessageEvent.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Mailer\Event;

use Symfony\Component\Mailer\Envelope;
use Symfony\Component\Mailer\Exception\LogicException;
use Symfony\Component\Messenger\Stamp\StampInterface;
use Symfony\Component\Mime\RawMessage;
use Symfony\Contracts\EventDispatcher\Event;

/**
 * Allows the transformation of a Message and the Envelope before the email is sent.
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
final class MessageEvent extends Event
{
    private RawMessage $message;
    private Envelope $envelope;
    private string $transport;
    private bool $queued;

    /** @var StampInterface[] */
    private array $stamps = [];

    public function __construct(RawMessage $message, Envelope $envelope, string $transport, bool $queued = false)
    {
        $this-&gt;message = $message;
        $this-&gt;envelope = $envelope;
        $this-&gt;transport = $transport;
        $this-&gt;queued = $queued;
    }

    public function getMessage(): RawMessage
    {
        return $this-&gt;message;
    }

    public function setMessage(RawMessage $message): void
    {
        $this-&gt;message = $message;
    }

    public function getEnvelope(): Envelope
    {
        return $this-&gt;envelope;
    }

    public function setEnvelope(Envelope $envelope): void
    {
        $this-&gt;envelope = $envelope;
    }

    public function getTransport(): string
    {
        return $this-&gt;transport;
    }

    public function isQueued(): bool
    {
        return $this-&gt;queued;
    }

    public function addStamp(StampInterface $stamp): void
    {
        if (!$this-&gt;queued) {
            throw new LogicException(sprintf('Cannot call &quot;%s()&quot; on a message that is not meant to be queued', __METHOD__));
        }

        $this-&gt;stamps[] = $stamp;
    }

    /**
     * @return StampInterface[]
     */
    public function getStamps(): array
    {
        if (!$this-&gt;queued) {
            throw new LogicException(sprintf('Cannot call &quot;%s()&quot; on a message that is not meant to be queued.', __METHOD__));
        }

        return $this-&gt;stamps;
    }
}
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