public function sendmail($maildata, $to, $subject, $attachments = [])
    {
        require_once(APPPATH.'third_party/PHPMailer/PHPMailerAutoload.php');
        //Create a new PHPMailer instance
        $mail = new PHPMailer;

        $mail->SMTPOptions = array(
            'ssl' => array(
                'verify_peer' => false,
                'verify_peer_name' => false,
                'allow_self_signed' => true
            )
        );

        //Tell PHPMailer to use SMTP
        $mail->isSMTP();
        //Enable SMTP debugging
        // 0 = off (for production use)
        // 1 = client messages
        // 2 = client and server messages
        $mail->SMTPDebug = 0;
        //Ask for HTML-friendly debug output
        $mail->Debugoutput = 'html';
        $mail->Host = 'SMTP_HOST';
        $mail->Port = 587;
        $mail->SMTPSecure = 'tls';
        $mail->SMTPAuth = true;
        $mail->XMailer = 'YOUR_SITENAME';
        $mail->Username = "YOUR_SMTP_USERNAME";
        $mail->Password = "YOUR_SMTP_PASSWORD";
        $mail->setFrom(EMAIL_FROM_ADDRESS, YOUR_SITENAME);
        $recipients =  explode(',', $to);
        foreach($recipients as $email)
        {
           $mail->AddAddress($email);
        }
        $mail->Subject = $subject;
        $mail->msgHTML($maildata);
        if(!empty($attachments)){
            foreach($attachments as $attachVal){
                $mail->addAttachment($attachVal);
            }
        }
        //send the message, check for errors
        if(!$mail->send()) {
            //echo $mail->ErrorInfo;exit;
            $return = false;
        } else {
            $return = true;
        }

        return $return;
    }