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Код



            Properties props = new Properties();
            props.put("mail.smtp.host", "host");
            props.put("mail.smtp.user", "host\\username");
            props.put("mail.transport.protocol", "smtp"); 
            props.put("mail.smtp.auth", "true");
            
            Session session = Session.getDefaultInstance(props, null);
            MimeMessage message = new MimeMessage(session);
            message.setContent("Hello1", "text/plain");
            message.setText("Hello1");
            message.setSubject("First");
            Address addressFrom = new InternetAddress("[email protected]", "USER1");
            message.setFrom(addressFrom);
            Address addressTo = new InternetAddress("[email protected]", "USER2");
            message.addRecipient(Message.RecipientType.TO,addressTo);
            
            message.saveChanges(); // implicit with send()
            Transport transport = session.getTransport("smtp");

            transport.connect("host", "host\\username", "pass");                  <<=========  ошибка !!!!
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();