通过javamail从办公室邮件发送电子邮件

Question

I am sending emails via gmail, but when I try to send emails from corporate mail I am get exception.

From company mail I can send email to another employees mail, but when I try to send to gmail account I get javax.mail.SendFailedException: Invalid Addresses; nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay exception. How can I fix it?

Via gmail

    final String username = "mail goes here";
    final String password = "password goes here";

    final String to = "mail goes here";
    final String from = username;

    Properties props = new Properties();
    props.put("mail.smtp.auth", "true");
    props.put("mail.transport.protocol", "smtp");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.port", "587");
    props.put("mail.smtp.ssl.trust", "smtp.gmail.com");

    Session session = Session.getInstance(props,
            new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(username, password);
                }
            });

    try {
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(toGmail));
        message.setSubject("Test");
        message.setText("Testing");
        Transport.send(message);
        System.out.println("Mail sent succesfully");
    } catch (MessagingException e) {
        throw new RuntimeException(e);
    }

Via corporate mail

    final String toGmail = "test@gmail.com";
    final String toCompany = "one of employees mail goes here";
    final String from = "company's noreply mail goes here";
    final String to = toGmail;

    Properties props = new Properties();
    props.put("mail.transport.protocol", "smtp");
    props.put("mail.smtp.port", "25");
    props.put("mail.smtp.host", "10.100.25.5");
    props.setProperty("mail.debug", "true");

   // props.put("mail.smtp.auth", "true");
   // props.put("mail.smtp.starttls.enable", "true");
   // props.put("mail.smtp.ssl.enable", "true");

    Session session = Session.getInstance(props);

    try {
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(to));
        message.setSubject("Test");
        message.setText("Testing");
        Transport.send(message);
        System.out.println("Mail sent succesfully");
    } catch (MessagingException e) {
        throw new RuntimeException(e);
    }

Answer 1

The answer is in the JavaMail FAQ . You're not authenticating to your corporate mail server so it's not letting you send messages outside the company.