public function sendMail(){
      $config = [
              'useragent' => 'CodeIgniter',
              'protocol'  => 'smtp',
              'mailpath'  => '/usr/sbin/sendmail',
              'smtp_host' => 'ssl://smtp.gmail.com',
              'smtp_user' => 'd.dawsie136@gmail.com', //Email sendiri
              'smtp_pass' => 'naonao123', //Pw nya
              'smtp_port' => 465,
              'smtp_keepalive' => TRUE,
              'smtp_crypto' => 'SSL',
              'wordwrap'  => TRUE,
              'wrapchars' => 80,
              'mailtype'  => 'html',
              'charset'   => 'utf-8',
              'validate'  => TRUE,
              'crlf'      => "\r\n",
              'newline'   => "\r\n",
          ];

          $this->load->library('email', $config);


          // Pengirim dan penerima email.
          $this->email->from('d.dawsie136@gmail.com', 'Dzakwan Dawsie');    // Email dan nama pegirim.
          $this->email->to('senkouk515@gmail.com'); //Email penerima                       // Penerima email.

          $this->email->subject('Kamu telah terdaftar !'); //Subjek
          $this->email->message($this->load->view('invoice','',true)); // Isi Pesannya

          $this->email->attach("http://localhost/project/tugassekolah/CrudCodeIgniter/assets/reportPeserta.pdf");

          if ($this->email->send()) {
            // code...
            echo "Pesan Telah terkirim";
          }else {
            // code...
            echo "Gagal mengirim Pesan";
          }
    }