Client host blocked - JavaMail

Question

I am unable to send a mail through JavaMail API this is the code:

package my.eliank.lgg.robots;

import java.time.LocalDateTime;
import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import my.eliank.lgg.MainFrame;

    public class MailBot {

        private String sender;
        private String host;
        private Properties properties;
        private Session session;

        public MailBot() {
            sender = "no-reply@baguette.ga";
            host = "mx1.freehostingnoads.net";
            properties = System.getProperties();
            properties.setProperty("mail.smtp.host", host);
            properties.setProperty("mail.smtp.port", "2525");
            properties.setProperty("mail.smtp.user", "user");
            properties.setProperty("mail.smtp.password", "password");
            session = Session.getDefaultInstance(properties);
        }

        public void sendMail(String recipient) {
            try {
                MimeMessage message = new MimeMessage(session);
                message.setFrom(new InternetAddress(sender));
                message.addRecipient(Message.RecipientType.TO, new InternetAddress(recipient));
                message.setSubject("Lotto numbers generation @" + LocalDateTime.now().toString().substring(0, 10));
                message.setText(MainFrame.textAreaOutput.getText());

                Transport.send(message);
                System.out.println("Message was successfully sent");
            } catch (MessagingException e) {
                e.printStackTrace();
            }
        }

    }

The problem is that whenever I try to send a mail through the host I get this exception:

    javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
    com.sun.mail.smtp.SMTPAddressFailedException: 554 5.7.1 Service unavailable; Client host [79.177.150.73] blocked using zen.spamhaus.org; http://www.spamhaus.org/query/bl?ip=79.177.150.73

    at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1873)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1120)
    at javax.mail.Transport.send0(Transport.java:195)
    at javax.mail.Transport.send(Transport.java:124)
    at my.eliank.lgg.robots.MailBot.sendMail(MailBot.java:41)
    at my.eliank.lgg.MainFrame$2.actionPerformed(MainFrame.java:108)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$500(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

What does this spamhaus IP block mean and how can I remove it? I am trying to send a mail through my host at http://www.freewebhostingnoads.net why I keep getting blocked?

Answer 1

Someone using your IP address, perhaps the previous user of that IP address on your web hosting service, is believed to be sending spam. Follow the links in the error message and it will tell you what to do. If you're using a dynamic IP address you may need to switch to a static IP address.