MailConnectException while sending mail using java mail api

Question

Trying to send an email using java mail api. And I keep getting MailConnectException. I have tried multiple ways to solve it without success.

Exception is thrown by this statement

transport.connect("smtp.gmail.com", "someone@gmail.com", "myPassword");

Can anyone tell me what I'm doing wrong?

public static void main(String[] args) {
    String host = "smtp.gmail.com";
    String from = "someone@gmail.com";
    Properties props = System.getProperties();
    props.put("mail.smtp.host", host);
    props.put("mail.smtp.user", from);
    props.put("mail.smtp.password", "myPassword");
    props.put("mail.smtp.port", "465"); 
    props.put("mail.smtp.auth", "true");
    try{
        Session session = Session.getDefaultInstance(props, null);
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.addRecipients(Message.RecipientType.TO, "someone@hotmail.com");
        message.setSubject("sending in a group");
        message.setText("Welcome to JavaMail");
        Transport transport = session.getTransport("smtp");
        transport.connect("smtp.gmail.com", "someone@gmail.com", "myPassword");//CAUSES EXCEPTION
        transport.sendMessage(message, message.getAllRecipients());
    }catch(MessagingException e){
        e.printStackTrace();
    }
}

Stack trace:

com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1;
  nested exception is:
    java.net.ConnectException: Connection timed out: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1984)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:656)
    at javax.mail.Service.connect(Service.java:345)
    at javax.mail.Service.connect(Service.java:226)
    at com.karmacrafts.util.CustomEmail.main(CustomEmail.java:127)
Caused by: java.net.ConnectException: Connection timed out: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(Unknown Source)
    at java.net.PlainSocketImpl.connectToAddress(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:301)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:229)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1950)
    ... 4 more

@Caadi0 Thanks for your comment. But I still get the same error. — Susie, Dec 24 '13 at 21:27

score 5 · Accepted Answer · edited May 23 '17 at 12:13

5

This looks like network problem. Even though it could occur due to variety of reasons, like :-

"Couldn't connect to host, port" could be caused by wrong host name, wrong port, a blocking firewall (on the server, on gateways, even on your own machine), network failure, server downtime, etc.

Can you connect to the mail server using telnet ?

Also see this FAQ for some mistakes you committed http://www.oracle.com/technetwork/java/javamail/faq/index.html#commonmistakes

Read this answer on how to send emails using gmail https://stackoverflow.com/a/47452/3107043

edited May 23 '17 at 12:13

Community

1
1

answered Dec 24 '13 at 21:36

Caadi0

504
8
23

copy pasted the same code from the gmail link you provided with and I still get the same error. – Susie Dec 24 '13 at 22:17
1

You were correct about the cause possibly being wrong port number I changed the port number to 587 and added this statement to my above code and it worked fine. props.put("mail.smtp.starttls.enable", "true"); – Susie Dec 25 '13 at 01:04

score 1 · Answer 2 · answered Dec 25 '13 at 13:50

Session session = Session.getInstance(props, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication(username, password);
}
});   
props.put("mail.smtp.port", "587");  transport.send(message);

score 1 · Answer 3 · answered May 13 '19 at 15:26

1

After 8 hours of pain, I've solved this by turning off:

1) my windows firewall

2) my antivirus software

hope this helps

answered May 13 '19 at 15:26

JeSa

559
4
11

score 0 · Answer 4 · answered Oct 28 '16 at 04:46

0

I met the same problem, and the reason is that I opened a vpn. Hope this will be helpful.

answered Oct 28 '16 at 04:46

Congmin Qiu

21
1

score 0 · Answer 5 · answered Nov 22 '20 at 10:30

0

For me, de-activating firewall and anti-virus did not work. I tried the alternate ports given in the mailtrap's SMTP settings 25 or 465 or 587 or 2525

changing spring.mail.port to 2525 in the applications.properties file worked for me

answered Nov 22 '20 at 10:30

Antariksh Gosain

1
2

score 0 · Answer 6 · answered Oct 18 '22 at 22:12

0

Open /etc/postfix/main.cf

Search /inet_interfaces line and comment localhost, un-comment all:

Restart the SMTP server using terminal command "postfix restart"

answered Oct 18 '22 at 22:12

Rogelio Navarrete

1

1

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Oct 21 '22 at 01:32

MailConnectException while sending mail using java mail api

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