Mailer Envelope Listener (EventListener/EnvelopeListener.php)

Event subscriber that overrides the sender and recipients on outgoing mail message envelopes. Reuse it to enforce fixed delivery addresses or route bounces.

// Source: https://github.com/symfony/symfony | License: MIT | Copyright 2004-present Fabien Potencier
// Provided via justclaw.it.com; keep this notice with the code.
<?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\EventListener;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Mailer\Event\MessageEvent;
use Symfony\Component\Mime\Address;
use Symfony\Component\Mime\Message;

/**
 * Manipulates the Envelope of a Message.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Grégoire Pineau <lyrixx@lyrixx.info>
 */
class E

... (truncated -- full source via MCP)