java - 无法使用 zoho smtp 服务器发送邮件

Question

我正在尝试使用以下代码使用 Zoho SMTP 服务器发送邮件:

 public void sendEmail(Email email) {
        Properties props = setupMailEnv();

        Session session = Session.getDefaultInstance(props,
                new javax.mail.Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication("sssxxxx@xxx.com", "xxxxx");
                    }
                });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(email.getFromMailId()));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(email.getToEmailId()));
            message.setSubject(email.getSubject());
            message.setText(email.getBody());

            Transport.send(message);

            log.info("Mail Sent.");

        } catch (MessagingException e) {
            throw e;
        }

    }

    private Properties setupMailEnv() {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.zoho.com");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class", javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");
        props.setProperty("mail.smtp.socketFactory.fallback", "false");
        props.put("mail.smtp.startssl.enable", "true");
        props.put("mail.smtp.starttls.enable", "false");
        return props;
    }

当我执行这个程序时，它给出了以下异常:

javax.mail.MessagingException: Can't send command to SMTP host;
  nested exception is:
    java.net.SocketException: Connection closed by remote host

我引用了 Zoho 论坛，但没有一个提供解决方案。我该如何解决这个问题？

Answer 1

我使用了以下属性来调试错误:

props.put("mail.debug", "true");

问题出在发件人地址上。发件人地址应与以下地址匹配:

new PasswordAuthentication("sssxxxx@xxx.com", "xxxxx");

我更改了它，一切都按预期正常工作。