Listener, that applies header to outgoing emails

ApplyMailHeader.php

<?php

namespace App\Listeners;

use Illuminate\Mail\Events\MessageSending;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Queue\InteractsWithQueue;

class ApplyMailHeader
{
    /**
    * Solves the issue of email senders having the '='and 'on behalf of' text in outlook.
    **/
  
    /**
     * Create the event listener.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Handle the event.
     *
     * @param  MessageSending  $event
     * @return void
     */
    public function handle(MessageSending $event)
    {
        $headers = $event->message->getHeaders();
        $headers->addTextHeader('sender', 'txkoutdoors.com');
    }
}