JavaMail SMTP Fehlermeldung

[Dana]

Hallo Freunde, was könnte bitte diese Fehlermeldung heißen? es geht um Email versenden

com.sun.mail.smtp.SMTPSendFailedException: 550 5.7.0 Need to authenticate via SMTP-AUTH-Login {mp046}

Danke

 

[DP]

"Need to authenticate via SMTP-AUTH-Login"

 

[DP]

     Properties props = System.getProperties();
      String subject = "betreff";
      String HOST = "deinHost";
      String USER = "deinUser";
      String PW = "deinPW";
      String FROM = "ich@domain.de";
      String PROTO = "smtp";
      
      props.put("mail.smtp.host", HOST);
      props.put("mail.smtp.auth", "true");

      Session mail_session = Session.getDefaultInstance(props, null);

      try {
        MimeMessage message = new MimeMessage(mail_session);
        Multipart multipart = new MimeMultipart();

        MimeBodyPart mimeBody = new MimeBodyPart();

        mimeBody.setContent("text der email", "text/html");
        multipart.addBodyPart(mimeBody);

        message.setContent(multipart);
        message.setFrom(new InternetAddress(FROM));
        message.addRecipient(Message.RecipientType.TO, new InternetAddress("du@domain.de"));
        message.setSubject(subject);
        message.saveChanges();

        Transport transport = mail_session.getTransport(PROTO);
        transport.connect(HOST, USER, PASS);
        transport.sendMessage(message, message.getAllRecipients());
        transport.close();
      }
      catch (Exception e) {
          e.printStackTrace();
      }