Failed to send email using javamail api on linux

Here is my code it works on windows machine but it doesn't work on linux ... it doesn't throw any exceptions .. on linux

public void alert(String recipient, String subject , String error){

    final String username = customize.getString("alertSenderEmail");
    final String password = customize.getString("alertSenderPassword");

    Properties props = new Properties();
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.auth", "true");
    props.put("mail.debug", "false");
    props.put("mail.smtp.host", "smtp1.qualitykiosk.com");
    props.put("mail.smtp.port", "25");

    Session session = Session.getInstance(props,
      new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(username, password);
        }
      });

    session.setDebug(true);

    String[] receivers = recipient.split(","); 
    for (String receiver : receivers) {

            try {


                Message message = new MimeMessage(session);
                message.setFrom(new InternetAddress(username));
                message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(receiver));
                message.setSubject(subject);
                message.setText(error);

                Transport.send(message);

                System.out.println("Done");

            } catch (MessagingException e) {
                //throw new RuntimeException(e);
            }
    }

}

      

        
        
        
      

    

Mistake -:

DEBUG: setDebug: JavaMail version 1.4ea
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp1.qualitykiosk.com", port 25, isSSL false
220 ESMTP ESMTP
DEBUG SMTP: connected to host "smtp1.qualitykiosk.com", port: 25

EHLO
501 Syntax: EHLO hostname
HELO
501 Syntax: HELO hostname
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp1.qualitykiosk.com", port 25, isSSL false
220 ESMTP ESMTP
DEBUG SMTP: connected to host "smtp1.qualitykiosk.com", port: 25

EHLO
501 Syntax: EHLO hostname
HELO
501 Syntax: HELO hostname
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp1.qualitykiosk.com", port 25, isSSL false
220 ESMTP ESMTP
DEBUG SMTP: connected to host "smtp1.qualitykiosk.com", port: 25

EHLO
501 Syntax: EHLO hostname
HELO
501 Syntax: HELO hostname