Erreur javaMail : Could not connect to SMTP host

Bonjour,
j'ai utiliser la classe suivante pour envoyer des email:

Code:

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import email.Mailer;
import java.util.Properties;
 
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMessage.RecipientType;
 
public class MailWithPasswordAuthentication {
	public static void main(String[] args) throws MessagingException {
		new MailWithPasswordAuthentication().run();
 
	}
 
	private void run() throws MessagingException {
		Message message = new MimeMessage(getSession());
 
 
		message.addRecipient(RecipientType.TO, new InternetAddress("myEmail@gmail.com"));
		message.addFrom(new InternetAddress[] { new InternetAddress("myEmail@gmail.com") });
 
		message.setSubject("the subject");
		message.setContent("the body", "text/plain");
 
		Transport.send(message);
 
 
 
	}
 
	private  Session getSession() {
		Authenticator authenticator = new Authenticator();
                //System.out.println("Start ... ");
 
		Properties properties = new Properties();
		properties.setProperty("mail.smtp.submitter", authenticator.getPasswordAuthentication().getUserName());
		properties.setProperty("mail.smtp.auth", "true");
              // properties.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
              //  properties.setProperty("mail.smtp.socketFactory.fallback", "javax.net.ssl.SSLSocketFactory");
                properties.setProperty("mail.smtp.starttls.enable", "false");
 
		properties.setProperty("mail.smtp.host", "smtp.offshorevalley.net");
		properties.setProperty("mail.smtp.port", "25");
 
 
		return Session.getInstance(properties, authenticator);
	}
 
	private class Authenticator extends javax.mail.Authenticator {
		private PasswordAuthentication authentication;
 
		public Authenticator() {
			String username = "myEmail@gmail.comt";
			String password = "myPassWord";
			authentication = new PasswordAuthentication(username, password);
		}
 
		protected PasswordAuthentication getPasswordAuthentication() {
			return authentication;
		}
	}
}

le problème est le suivant;
le code ca marche bien dans un premier temps et après quelque utilisation je rencontre l'erreur suivant :

Code:

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Exception in thread "main" javax.mail.MessagingException: Could not connect to SMTP host: smtp.offshorevalley.net, port: 25;
  nested exception is:
	java.net.ConnectException: Connection timed out: connect
	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
	at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
	at javax.mail.Service.connect(Service.java:317)
	at javax.mail.Service.connect(Service.java:176)
	at javax.mail.Service.connect(Service.java:125)
	at javax.mail.Transport.send0(Transport.java:194)
	at javax.mail.Transport.send(Transport.java:124)
	at Test.MailWithPasswordAuthentication.run(MailWithPasswordAuthentication.java:31)
	at Test.MailWithPasswordAuthentication.main(MailWithPasswordAuthentication.java:17)
Caused by: java.net.ConnectException: Connection timed out: connect
	at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:337)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:198)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
	at java.net.Socket.connect(Socket.java:579)
	at java.net.Socket.connect(Socket.java:528)
	at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288)
	at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
	... 8 more
Java Result: 1

j'ai essayer avec plusieurs code et toujours les mêmes résultat ( tout ça marche bien dans un premier temps,et en suite l'erreur :(

ya quelqu’un qui peut me dire pourquoi cette erreur ??

Merci en avance !!