Email not being sent Laravel

In controller(maildata and query_string are arrays and being sent):

$this->dispatch(new SendBulkRegisterEmail($maildata,$query_string));

In SendBulkRegisterEmail

public $query_string, $maildata;

    public function __construct($maildata, $query_string)
    {
        $this->query_string = $query_string;
        $this->maildata = $maildata;
    }

    /**
     * Execute the job.
     *
     * @return void
     */
    public function handle()
    {
        try{
            for ($i=0; $i < count($this->maildata) ; $i++) {
                $mailers = $maildata[$i];
                Mail::send('mails.new_user_mail', $mailers, function($message)  use ($mailers)
                {
                    $message->to($mailers["toemail"],$mailers['studentname'])->subject($mailers['subject']);
                });
            }
        }catch(Exception $e){
        }
    }

The mail is not being sent. Someone please help Thanks in Advance

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