Re: javamail + EXIM -- repeated mails

Bart Ogryczak <>
Thu, 22 May 2008 08:17:33 +0000 (UTC)
On 2008-05-21, citizen Dave Miller testified:

Bart Ogryczak wrote:

I'm trying to send a quiet a few mails using multithreaded aplication,
sending to various outgoing SMTP servers (EXIM). Some of those mails
get resent after exactly 3600s, with different MsgID. How can I avoid

For troubleshooting help, please post your code.

public class MailSender implements Runnable {
private BlockingQueue<Map> queue;
Session mailSession;
/*... more stuff related to generation of content...*/

public MailSender(BlockingQueue<Map> queue, String smtp) {
    this.queue = queue;
    if(smtp.contains(":")) {
    String[] smtpSplit = smtp.split(":");
    smtpHost = smtpSplit[0];
    smtpPort = Integer.parseInt(smtpSplit[1]);
    } else {
    smtpHost = smtp;
    smtpPort = 25;

public void run() {
    try {
    while(true) {
        Map t = queue.take(); //content data
        if(t.containsKey(this.config.getString("POISON"))) break;
        try {
            Properties props = new Properties();
            props.put("mail.smtp.allow8bitmime", "true");
            props.put("", smtpHost);
            props.put("mail.smtp.port", ""+smtpPort );
            props.put("mail.smtp.from", "" );
            props.put("mail.from", "" );
            mailSession = Session.getInstance(props);

            SimpleEmail email = new SimpleEmail(); /* from apache.commons.mail */
            email.setSubject("my subject");
            String html = contentGenerator.getContent(t);
            try {
            } catch (Exception e) {
            System.out.println("send failed "+t);
        } catch (Exception e) {
            System.out.println("failed processing "+t);

    } catch(InterruptedException e) {}
    } //end run
} //end class

In the main app, I create 50 threads sending to 8 SMTP servers.

taskQueue = new LinkedBlockingQueue<Map>(config.getInt("TASK_QUEUE"));
String[] smtp = config.getStringArray("SMTP_SERVERS");

for(int i=0;i<nThrsTasks;i++) {
    new Thread(new MailSender(taskQueue,smtp[i%smtp.length])).start();

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