CODEWITHSUNDEEP
javasmtpgmailjakarta-mail
user1900376
user1900376

Reputation: 271

Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1

While sending mail, I am getting this error:

java.lang.RuntimeException: javax.mail.SendFailedException: Sending failed; nested exception is: class javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1

Here is my code:

Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");

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

try {
    Message message = new MimeMessage(session);
    message.setFrom(new InternetAddress("email"));
    message.setRecipients(Message.RecipientType.TO,
        InternetAddress.parse(this.to));
    message.setSubject("Testing");
    message.setText("Hey, this is the testing email.");

    Transport.send(message);
    // ...
}

What is the cause of this error, and how can the problem be resolved?

Upvotes: 26

Views: 167473

Answers (5)

Tipxbomb
Tipxbomb

Reputation: 81

In my case it was Avast Antivirus interfering with the connection. Actions to disable this feature: Avast -> Settings-> Components -> Mail Shield (Customize) -> SSL scanning -> uncheck "Scan SSL connections".

Upvotes: 2

M. Usman Khan
M. Usman Khan

Reputation: 4458

You need to tell it that you are using SSL:

props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

In case you miss anything, here is working code:

String  d_email = "[email protected]",
            d_uname = "Name",
            d_password = "urpassword",
            d_host = "smtp.gmail.com",
            d_port  = "465",
            m_to = "[email protected]",
            m_subject = "Indoors Readable File: " + params[0].getName(),
            m_text = "This message is from Indoor Positioning App. Required file(s) are attached.";
    Properties props = new Properties();
    props.put("mail.smtp.user", d_email);
    props.put("mail.smtp.host", d_host);
    props.put("mail.smtp.port", d_port);
    props.put("mail.smtp.starttls.enable","true");
    props.put("mail.smtp.debug", "true");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.socketFactory.port", d_port);
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.socketFactory.fallback", "false");

    SMTPAuthenticator auth = new SMTPAuthenticator();
    Session session = Session.getInstance(props, auth);
    session.setDebug(true);

    MimeMessage msg = new MimeMessage(session);
    try {
        msg.setSubject(m_subject);
        msg.setFrom(new InternetAddress(d_email));
        msg.addRecipient(Message.RecipientType.TO, new InternetAddress(m_to));

Transport transport = session.getTransport("smtps");
            transport.connect(d_host, Integer.valueOf(d_port), d_uname, d_password);
            transport.sendMessage(msg, msg.getAllRecipients());
            transport.close();

        } catch (AddressException e) {
            e.printStackTrace();
            return false;
        } catch (MessagingException e) {
            e.printStackTrace();
            return false;
        }

Upvotes: 19

MesamH
MesamH

Reputation: 101

What i did was i commented out the 

props.put("mail.smtp.starttls.enable","true");

Because apparently for G-mail you did not need it. Then if you haven't already done this you need to create an app password in G-mail for your program. I did that and it worked perfectly. Here this link will show you how: https://support.google.com/accounts/answer/185833.

Upvotes: 1

ronIT
ronIT

Reputation: 1275

I have been experiencing this issue when debugging using NetBeans, even executing the actual jar file. Antivirus would block sending email. You should temporarily disable your antivirus during debugging or exclude NetBeans and the actual jar file from being scanned. In my case, I'm using Avast.

See this link on how to Exclude : How to Add File/Website Exception into avast! Antivirus 2014

It works for me.

Upvotes: 6

AnFi
AnFi

Reputation: 10913

Port 465 is for "smtp over SSL".

http://javamail.kenai.com/nonav/javadocs/com/sun/mail/smtp/package-summary.html

[...] For example, use
    props.put("mail.smtp.port", "888");
to set the mail.smtp.port property, which is of type int.

Note that if you're using the "smtps" protocol to access SMTP over SSL, 
all the properties would be named "mail.smtps.*"

Upvotes: 1

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