Send email get stuck at transport.connect

Question

This is the code:

Properties properties = new Properties();
properties.put("mail.transport.protocol", "smtps");
properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.smtp.host", "mail.mydomain.com");
properties.put("mail.smtp.port", "465");
properties.put("mail.smtp.auth", "true");
properties.put("mail.smtp.user", "myemail@mydomain.com");
properties.put("mail.smtp.password", "mypassword");

Session sendSession = Session.getInstance(properties);

MimeMessage message = new MimeMessage(sendSession);
message.setFrom(new InternetAddress("myemail@mydomain.com"));
message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
message.setSubject(subject);
message.setText(content);

Transport transport = sendSession.getTransport("smtp");
transport.connect("mail.mydomain.com", 465, "mydomain.com@mydomain.com", "mypassword");
transport.sendMessage(message, message.getAllRecipients());
transport.close();

These are the SSL/TLS setting:

Outgoing Server: mail.mydomain.com
SMTP Port: 465

Executing the above code, it get stuck at:

transport.connect("mail.mydomain.com", 465, "mydomain.com@mydomain.com", "mypassword");

and nothing happen.

Why it get stuck at connect and how to fix it?

Try changing the ```mail.smtp.starttls.enable``` to false and try sending the mail — Umeshwaran, Jun 08 '21 at 13:33
Try changing the ```properties.put("mail.transport.protocol", "smtps");``` to ```properties.put("mail.transport.protocol", "smtp");``` i.e ```smtps``` to ```smtp``` and try sending mail — Umeshwaran, Jun 08 '21 at 13:39
Looks like the response from the mail server is not reaching your program. You should check the firewall and proxy settings. Try to connect from the command line: https://stackoverflow.com/a/27030820/2135838 — Sascha, Jun 08 '21 at 13:41
@Sascha, if i'm using gmail, it works. But with mydomain not. — KunLun, Jun 08 '21 at 13:44
add ```mail.debug=true``` property and check the debug trace — Umeshwaran, Jun 08 '21 at 13:45
@KunLun Have you checked if a normal mail client can connect with your mail server? — Sascha, Jun 08 '21 at 13:45
@KunLun Did you the check from the command line? Also, you should set a connection timeout. properties.setProperty("mail.connectiontimeout", "30000"); properties.setProperty("mail.timeout", "30000"); — Sascha, Jun 08 '21 at 13:51

score 1 · Answer 1 · answered Jun 08 '21 at 13:43

Try changing the mail.transport.protocol value from smtps to smtp.

You are trying to use port 465 which is for smtp . So you have to change the protocol to smtp . You are trying to start TLs with secure mode but you are using simple smtp port.

Properties properties = new Properties();
properties.put("mail.transport.protocol", "smtps");
properties.put("mail.smtp.starttls.enable", "true");
.....

Try changing it and send mail.

score 0 · Accepted Answer · answered Jun 08 '21 at 14:01

0

I found the problem.

At Transport transport = sendSession.getTransport("smtp");

Instead of smtp should be smtps

Thanks to everybody who tried to help me.

answered Jun 08 '21 at 14:01

KunLun

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Send email get stuck at transport.connect

2 Answers2