Call java method confirmation

Question

I'm using this code to send e-mails to mail boxes.

private String sendFromGMail(String from, String pass, String[] to, String subject, String body)
    {
        Properties props = System.getProperties();
        String host = "smtp.gmail.com";
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.user", from);
        props.put("mail.smtp.password", pass);
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");

        Session session = Session.getDefaultInstance(props);
        MimeMessage message = new MimeMessage(session);

        try
        {
            message.setFrom(new InternetAddress(from));
            InternetAddress[] toAddress = new InternetAddress[to.length];

            // To get the array of addresses
            for (int i = 0; i < to.length; i++)
            {
                toAddress[i] = new InternetAddress(to[i]);
            }

            for (int i = 0; i < toAddress.length; i++)
            {
                message.addRecipient(Message.RecipientType.TO, toAddress[i]);
            }

            message.setSubject(subject);
            message.setText(body);
            Transport transport = session.getTransport("smtp");
            transport.connect(host, from, pass);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        }
        catch (AddressException ae)
        {
            ae.printStackTrace();
        }
        catch (MessagingException me)
        {
            me.printStackTrace();
        }

     return "message is send";
    }

I'm interested how I can inset some check is this e-mail successfully send. For example is there any way to check is there any Exception? If there no Exception to return "Mail is send".

Answer 1

Look here: Java Mail API. Basically you can do 2 things:

1. Implement and Register a TransportListener
2. Catch these exceptions:

SendFailedException - if the send failed because of invalid addresses. MessagingException - if the connection is dead or not in the connected state

For example:

TransportListener listener = new MyTransportAdapter();
transport.addTransportListener(listener);

where:

class MyTransportAdapter extends TransportAdapter {
//Implement only methods of interest from TransportAdapter API
}