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$config = Array(
              'protocol' => 'smtp',
              'smtp_host' => 'ssl://smtp.google.com',
              'smtp_port' => 465,
              'smtp_user' => 'sender@gmail.com',
              'smtp_pass' => 'password'
    );

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

    $this->email->from("sender@gmail.com");
    $this->email->to("receiver@gmail.com");
    $this->email->subject("Email with Codeigniter");
    $this->email->message("This is email has been sent with Codeigniter");

    if($this->email->send())
    {
        echo "Your email was sent.!";
    } else {
        show_error($this->email->print_debugger());
    }

public function send_mail()
    {
        require_once(APPPATH.'third_party/PHPMailer-master/PHPMailerAutoload.php');
        $mail = new PHPMailer();
        $mail->IsSMTP(); // we are going to use SMTP
        $mail->SMTPAuth   = true; // enabled SMTP authentication
        $mail->SMTPSecure = "ssl";  // prefix for secure protocol to connect to the server
        $mail->Host       = "smtp.gmail.com";      // setting GMail as our SMTP server
        $mail->Port       = 465;                   // SMTP port to connect to GMail
        $mail->Username   = "mail@gmail.com";  // user email address
        $mail->Password   = "password";            // password in GMail
        $mail->SetFrom('mail@gmail.com', 'Mail');  //Who is sending
        $mail->isHTML(true);
        $mail->Subject    = "Mail Subject";
        $mail->Body      = '
            <html>
            <head>
                <title>Title</title>
            </head>
            <body>
            <h3>Heading</h3>
            <p>Message Body</p><br>
            <p>With Regards</p>
            <p>Your Name</p>
            </body>
            </html>
        ';
        $destino = receiver@gmail.com; // Who is addressed the email to
        $mail->AddAddress($destino, "Receiver");
        if(!$mail->Send()) {
            return false;
        } else {
            return true;
        }
    }

'smtp_host' => 'ssl://smtp.googlemail.com',