Sending email using SMTP

问题:

hi I have written this code to connect SMTP it is working fine for smtp.gmail.com but not for my client for IP 10.5.128.146 with port no 25.

here the code is ..... can you suggest me any solution.

 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;

public class SendMailSSL {
public static void main(String[] args) {
    Properties props = new Properties();
    props.put("mail.smtp.host", "10.5.128.146");
    props.put("mail.smtp.socketFactory.port", "25");
    props.put("mail.smtp.socketFactory.class",
            "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.port", "25");

    Session session = Session.getDefaultInstance(props,
        new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("username","password");
            }
        });

    try {

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("[e-mail]"));
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse("[e-mail]"));
        message.setSubject("Testing Subject");
        message.setText("Dear Mail Crawler," +
                "\n\n No spam to my email, please!");

        Transport.send(message);

        System.out.println("Done");

    } catch (MessagingException e) {
        throw new RuntimeException(e);
    }
}

}

it shows connection time out error. anyone can tell me is this really a programming problem or server side problem.if server side then what can I suggest them to do.

Thnaks in Adance

回答1:

You appear to have modified a GMail connection snippet. GMail requires SSL but a traditional "port 25" SMTP server does not so the handshake does not work properly.

I would suggest removing the mail.smtp.socketFactory.class and mail.smtp.auth properties.

回答2:

Timed out suggests that port 25 is firewalled and the firewall is simply dropping packets, rather than replying with a connection refused.

回答3:

check to see if you are able to telnet on port 25 for that IP of yours...if you are able to telnet, that means the port is not firewalled and there are connectivity issues....if it is blocked by the firewall, you need to apply rules to allow this connection!!!