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Editing: SentMessage.php

<?php

namespace Illuminate\Mail;

use Illuminate\Support\Traits\ForwardsCalls;
use Symfony\Component\Mailer\SentMessage as SymfonySentMessage;

/**
 * @mixin \Symfony\Component\Mailer\SentMessage
 */
class SentMessage
{
    use ForwardsCalls;

/**
     * The Symfony SentMessage instance.
     *
     * @var \Symfony\Component\Mailer\SentMessage
     */
    protected $sentMessage;

/**
     * Create a new SentMessage instance.
     *
     * @param  \Symfony\Component\Mailer\SentMessage  $sentMessage
     * @return void
     */
    public function __construct(SymfonySentMessage $sentMessage)
    {
        $this->sentMessage = $sentMessage;
    }

/**
     * Get the underlying Symfony Email instance.
     *
     * @return \Symfony\Component\Mailer\SentMessage
     */
    public function getSymfonySentMessage()
    {
        return $this->sentMessage;
    }

/**
     * Dynamically pass missing methods to the Symfony instance.
     *
     * @param  string  $method
     * @param  array  $parameters
     * @return mixed
     */
    public function __call($method, $parameters)
    {
        return $this->forwardCallTo($this->sentMessage, $method, $parameters);
    }
}

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