com.sun.mail.util.MailConnectException: Couldn't connect to host, port: localhost, 25; timeout -1;

Question

package jmail;

import java.util.Date; import java.util.Properties; 
import javax.mail.Authenticator; import javax.mail.Message; 
import javax.mail.MessagingException; 
import javax.mail.PasswordAuthentication; 
import javax.mail.Session; 
import javax.mail.Transport; 
import javax.mail.internet.AddressException; 
import javax.mail.internet.InternetAddress; 
import javax.mail.internet.MimeMessage;

public class HtmlJavaSend {

public void sendHtmlEmail(String host, String port,
        final String userName, final String password, String toAddress,
        String subject, String message) throws AddressException,
        MessagingException {

    // sets SMTP server properties
    Properties properties = new Properties();
    properties.put("mail.man.com", host);
    properties.put("mail.25", port);
    properties.put("mail.smtp.auth", "true");
    properties.put("mail.smtp.starttls.enable", "true");
    properties.put("mail.smtp.ssl.trust","mail.man.com");

    // creates a new session with an authenticator
    Authenticator auth = new Authenticator() {
        public PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(userName, password);
        }
    };

    Session session = Session.getInstance(properties, auth);

    // creates a new e-mail message
    Message msg = new MimeMessage(session);

    msg.setFrom(new InternetAddress(userName));
    InternetAddress[] toAddresses = {new InternetAddress(toAddress)};
    msg.setRecipients(Message.RecipientType.TO, toAddresses);
    msg.setSubject(subject);
    msg.setSentDate(new Date());
    // set plain text message
    msg.setContent(message, "text/html");

    // sends the e-mail
    Transport.send(msg);

}

public static void main(String[] args) {
    // SMTP server information
    String host = "mail.man.com";
    String port = "25";
    String mailFrom = "[email protected]";
    String password = "Man";

    // outgoing message information
    String mailTo = "[email protected]";
    String subject = "Hello my friend";

    // message contains HTML markups
    String message = "<i>Greetings!</i><br>";
    message += "<b>Wish you a nice day!</b><br>";
    message += "<font color=red>Duke</font>";

    HtmlJavaSend mailer = new HtmlJavaSend();

    try {
        mailer.sendHtmlEmail(host, port, mailFrom, password, mailTo,
                subject, message);
        System.out.println("Email sent.");
    } catch (Exception ex) {
        System.out.println("Failed to sent email.");
        ex.printStackTrace();
    }
} }

The error is:

eror run: Failed to sent email. com.sun.mail.util.MailConnectException: Couldn't connect to host, port: localhost, 25; timeout -1; nested exception is: java.net.ConnectException: Connection refused: connect at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2100) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:699) at javax.mail.Service.connect(Service.java:388) at javax.mail.Service.connect(Service.java:246) at javax.mail.Service.connect(Service.java:195) at javax.mail.Transport.send0(Transport.java:254) at javax.mail.Transport.send(Transport.java:124) at jmail.HtmlJavaSend.sendHtmlEmail(HtmlJavaSend.java:62) at jmail.HtmlJavaSend.main(HtmlJavaSend.java:85) Caused by: java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) 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:331) at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2066) ... 8 more BUILD SUCCESSFUL (total time: 1 second)

Answer 1

You have error here:

properties.put("mail.man.com", host);
properties.put("25", port);

It should be:

properties.put("mail.smtp.host", host);
properties.put("mail.smtp.port", port);

Answer 2

According to:

properties.put("mail.25", port);

you are connecting to the port offering plaintext SMTP. This is backed by your observation to receive 202 service ready message message when using telnet. But you are also setting properties to use TLS:

properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.smtp.ssl.trust","mail.man.com");

If you use port 25 just don't enable TLS, or, use port 465 (standard port for SMTP with TLS) with TLS enabled.