I search all possible solutions to these problems and try but still not working.I contact my server which is webpandahost but they said it is working.
function send_email()
{
    $config['protocol']     = 'smtp';
    $config['smtp_host']    = 'server.multimedia-street.com';
    $config['smtp_port']    = '465';
    $config['smtp_timeout'] = '7';
    $config['smtp_user']    = 'bjmpncr@thefourpobu.com';
    $config['smtp_pass']    = 'admin123';
    $config['charset']      = 'utf-8';
    $config['newline']      = "\r\n";
    $config['mailtype']     = 'text';
    $this->email->initialize($config);
    $this->email->from('bjmpncr@thefourpobu.com', 'SJCDRRMO');
    $this->email->to('ruedastefano@gmail.com');
    $this->email->subject('Password Reset');
    $this->email->message('We have reset your request. Your new password:  Do not reply to this email.');
    if($this->email->send()) {
        echo "success";
    } else {
        echo $this->email->print_debugger();
    }
}
Error message:
The IP address sending this message does not have a
550-5.7.1 PTR record setup. As a policy, Gmail does not accept messages from
550-5.7.1 IPs with missing PTR records. Please visit
550-5.7.1  https://support.google.com/mail/answer/81126#authentication for more
550 5.7.1 information. dn3si12455081pac.266 - gsmtp