ldc-supportweb/app/Mail/TicketUpdate.php

<?php

namespace App\Mail;

use App\Lib\Utils;
use App\Models\Ticket;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

class TicketUpdate extends Mailable
{
    use Queueable;
    use SerializesModels;

    /** @var Ticket */
    private $ticket;

    /** @var string */
    private $corpsMaj;

    /**
     * Create a new message instance.
     *
     * @return void
     */
    public function __construct(Ticket $ticket, string $corpsMaj)
    {
        $this->ticket = $ticket;
        $this->corpsMaj = $corpsMaj;
    }

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        $ticket = $this->ticket;
        $corpsMaj = Utils::plainToHtml($this->corpsMaj);
        return $this->subject("[SupportWeb] Le ticket n°" . $ticket->id . " à été mis à jour")
        ->view('emails.ticket-update', compact('ticket', 'corpsMaj'));
    }
}