问Laravel 5.6:如何发送电子邮件，客户端会将它们显示为线程/对话？

EN

public function build()
{
    $email_from_name = "Support - " . config('app.name');
    $subject = "[" . $this->ticket->id . "] " . $this->ticket->subject . " - " . config('app.name');

    return $this->from('support@example.com', $email_from_name)
                    ->subject($subject)
                    ->markdown('emails.customer.ticket.comment_added')
                        ->with([
                            'nickname' => $this->user->nickname,
                            'ticket_id' => $this->ticket->id,
                            'ticket_subject' => $this->ticket->subject,
                            'ticket_text' => $this->ticket_comments->text,
                        ]);
}