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Home/ Questions/Q 9155
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Alek Richter
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Alek RichterEnlightened
Asked: January 13, 20222022-01-13T13:59:54+00:00 2022-01-13T13:59:54+00:00

Could not connect to SMTP host: smtp.gmail.com, port: 587; nested exception is: java.net.ConnectException: Connection timed out: connect

  • 0

Here is the code of the application. I have been trying to run this using eclipse IDE. I also added all the required java mail jar files namely dsn.jar,imap.jar,mailapi.jar,pop3.jar,smtp.jar,mail.jar. But it gives the following error Could not connect to SMTP host: smtp.gmail.com, port: 587.

There’s no firewall blocking access because a reply is received on pinging smtp.gmail.com. I have even tried it this way :

  • First sign into the Gmail account in a browser on the device where you are setting up/using your client
  • Go here and enable access for “less secure” apps: https://www.google.com/settings/security/lesssecureapps
  • Then go here: https://accounts.google.com/b/0/DisplayUnlockCaptcha and click Continue.
  • Then straightaway go back to your client and try again.

javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 587; nested exception is: java.net.ConnectException: Connection timed out: connect at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1972) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:642) 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 PlainTextEmailSender.sendPlainTextEmail(PlainTextEmailSender.java:50) at PlainTextEmailSender.main(PlainTextEmailSender.java:73) Caused by: java.net.ConnectException: Connection timed out: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:319) at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:233) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1938)

    package net.codejava.mail;

    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 PlainTextEmailSender {

        public void sendPlainTextEmail(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.smtp.host", host);
            properties.put("mail.smtp.port", port);
            properties.put("mail.smtp.auth", "true");
            properties.put("mail.smtp.starttls.enable", "true");

            // 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.setText(message);

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

        }

        /**
         * Test the send e-mail method
         *
         */
        public static void main(String[] args) {
            // SMTP server information
            String host = "smtp.gmail.com";
            String port = "587";
            String mailFrom = "user_name";
            String password = "password";

            // outgoing message information
            String mailTo = "email_address";
            String subject = "Hello my friend";
            String message = "Hi guy, Hope you are doing well. Duke.";

            PlainTextEmailSender mailer = new PlainTextEmailSender();

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

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1 Answer

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  1. Alek Richter Enlightened
    2022-01-13T14:00:18+00:00Added an answer on January 13, 2022 at 2:00 pm

    For all those who are still looking for the answer explained in a simple way, here is the answer:

    Step 1: Most of the Anti Virus programs block sending of Email from the computer through an internal application. Hence if you get an error, then you will have to disable your Anti Virus program while calling these Email sending methods/APIs.

    Step 2: SMTP access to Gmail is disabled by default. To permit the application to send emails using your Gmail account follow these steps

    Open the link: https://myaccount.google.com/security?pli=1#connectedapps
    In the Security setting, set ‘Allow less secure apps’ to ON.

    Step 3: Here is a code snippet from the code that I have used and it works without any issues. From EmailService.java:

    private Session getSession() {
    //Gmail Host
    String host = “smtp.gmail.com”;
    String username = “[email protected]”;
    //Enter your Gmail password
    String password = “”;

    Properties prop = new Properties();
    prop.put(“mail.smtp.auth”, true);
    prop.put(“mail.smtp.starttls.enable”, “true”);
    prop.put(“mail.smtp.host”, host);
    prop.put(“mail.smtp.port”, 587);
    prop.put(“mail.smtp.ssl.trust”, host);

    return Session.getInstance(prop, new Authenticator() {
    @Override
    protected PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication(username, password);
    }
    });
    }

    I have also written a blog post and a working application on GitHub with these steps. Please check: http://softwaredevelopercentral.blogspot.com/2019/05/send-email-in-java.html

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