How can I get SMTP server response using JavaMail?

Question

I'm using JavaMail 1.5 to send mail and see from my tests that messages are sent successfully. I use SMTPTransport to get last server response, but it's empty, same as code. getReportSuccess() returns false.

SMTPTransport t = (SMTPTransport)session.getTransport("smtps");
t.send(message);
String response = t.getLastServerResponse();
boolean s = t.getReportSuccess();
int code = t.getLastReturnCode();
return response;

What can be the reason of getting such response, though the message is sent successfully?

Is there any way to get correct SMTP response?

Answer 1

I am not sure that it is completely cover this question, but as I glanced on SMTPTransport.java, the description to getReportSuccess() says:

/**
     * Should we report even successful sends by throwing an exception?
     * If so, a <code>SendFailedException</code> will always be thrown and
     * an {@link com.sun.mail.smtp.SMTPAddressSucceededException
     * SMTPAddressSucceededException} will be included in the exception
     * chain for each successful address, along with the usual
     * {@link com.sun.mail.smtp.SMTPAddressFailedException
     * SMTPAddressFailedException} for each unsuccessful address.
     *
     * @return  true if an exception will be thrown on successful sends.
     *
     * @since JavaMail 1.3.2
     */
    public synchronized boolean getReportSuccess() {
        return reportSuccess;
    }

So, in my code, to be made sure that sending proccess has been successfuly done, I invoked setReportSuccess(true); before sending and then handled an exception com.sun.mail.smtp.SMTPAddressSucceededException. The following code snippet works for me fine:

public synchronized void sendMail(String subject, String body, String user, String oauthToken, String recipients, String attachment)
{
    try {
        SMTPTransport smtpTransport = connectToSmtp("smtp.gmail.com", 587, user, oauthToken, true);
        MimeMessage message = new MimeMessage(session);

        /*Set whether successful sends should be reported by throwing
        **an exception.
        */
        smtpTransport.setReportSuccess(true);

        /**
        ***All actions to got the formated message
        **/

        /*Send message*/
        smtpTransport.sendMessage(message, message.getAllRecipients());
    } catch(android.os.NetworkOnMainThreadException e){
        Log.d("MY_LOG","NetworkOnMainThreadException");
    }
    catch(com.sun.mail.smtp.SMTPAddressSucceededException e){
        /**
        ***Message has been sent. Do what you need.
        **/         
    }
    catch (Exception e) {
        Log.d("MY_LOG", e.getMessage());
    }
}