authentication is required (java发送邮件)

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使用java实现邮件发送，今天遇到个authentication is required
代码如下：

public void sendEmail(String to, String subject, String content, boolean isMultipart, boolean isHtml) {
        log.debug("Send e-mail[multipart '{}' and html '{}'] to '{}' with subject '{}' and content={}",isMultipart, isHtml, to, subject, content);

        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        try {
            MimeMessageHelper message = new MimeMessageHelper(mimeMessage, isMultipart, CharEncoding.UTF_8);
            message.setTo(to);
            message.setFrom(jHipsterProperties.getMail().getFrom());
            message.setSubject(subject);
            message.setText(content, isHtml);
            javaMailSender.send(mimeMessage);
            log.debug("Sent e-mail to User '{}'", to);
        } catch (Exception e) {
            log.warn("E-mail could not be sent to user '{}', exception is: {}", to, e.getMessage());
        }
    }

结果报错：authentication is required

最后解决方案是在javaMailSender中增加了【mail.smtp.auth】设置，设置方法如下：

public void sendEmail(String to, String subject, String content, boolean isMultipart, boolean isHtml) {
        log.debug("Send e-mail[multipart '{}' and html '{}'] to '{}' with subject '{}' and content={}",isMultipart, isHtml, to, subject, content);

        Properties props = new Properties();         // 参数配置
        props.setProperty("mail.smtp.auth", "true"); // 需要请求认证
        javaMailSender.setJavaMailProperties(props);
        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        try {
            MimeMessageHelper message = new MimeMessageHelper(mimeMessage, isMultipart, CharEncoding.UTF_8);
            message.setTo(to);
            message.setFrom(new InternetAddress(jHipsterProperties.getMail().getFrom(), "电子商城", "UTF-8"));  //设置邮件显示的发送人
            message.setSubject(subject);  //主题
            message.setText(content, isHtml);  //文件内容，html
            javaMailSender.send(mimeMessage);  //发送
            log.debug("Sent e-mail to User '{}'", to);
        } catch (Exception e) {
            log.warn("E-mail could not be sent to user '{}', exception is: {}", to, e.getMessage());
        }
    }

测试发送成功