javax.mail.MessagingException: Could not connect to SMTP host?

Question

following is my code to send mail:

import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.Message.Recipie         


        

Answer 1

This is these two lines which was casting me the problem :

m_properties.put("mail.smtp.socketFactory.port", "465");
  m_properties.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");

and added this line :

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

After removing and adding the above lines of code it worked fine.

Answer 2

Try to add port 9000 to your inbound rules in your windows firewall.

Answer 3

This exception usually occurs when there is no service listening on the port you are trying to connect to.

Try to connect using putty or telnet. I can bet you will get the same error.

Verify these things:

• Host name and port you're trying to connect to,
• The server is listening correctly, and
• There's no firewall blocking the connection.

Answer 4

What causes your problem is right there in the stack trace:

java.net.ConnectException: Connection refused: connect

do you need a password to connect to the SMTP server? Are you sure you are using the right settings (as in port number)? Are you behind a proxy or a firewall? Can you use those settings in a regular mail program (e.g. Thunderbird) and send mails?