__construct(private readonly int $mail_id, private readonly int $user_id, private readonly int $folder_id, private readonly ?int $sender_id=null, private readonly ?DateTimeImmutable $send_time=null, private readonly ?string $status=null, private readonly ?string $subject=null, private readonly ?string $import_name=null, private readonly ?bool $use_placeholders=false, private readonly ?string $message=null, private readonly ?string $rcp_to=null, private readonly ?string $rcp_cc=null, private readonly ?string $rcp_bc=null, private readonly ?array $attachments=[], private readonly ?string $tpl_ctx_id=null, private readonly ?string $tpl_ctx_params=null)