Sending mail error, javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;

Error is self explainatory: javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;

You have no SMTP server on localhost, but you configure it there :

  // Assuming you are sending email from localhost
  String host = "localhost";
  ...
  // Setup mail server
  properties.setProperty("mail.smtp.host", host);

So you must:

  • either configure a local SMTP server as a relay on your local system (Postfix or sendmail are two well knows servers)
  • of configure a dummy server that simply traces the mail request but does not even try to deliver mail (Python is known to have such dummy servers out of the box)
  • or configure your application with a server that you are allowed to use – contact your system admin in a corporate environment, or your ISP in an individual one. Anyway, you will need that even to configure a true relay.

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