Bingpreview会使电子邮件中的一次性链接无效

如何阻止电子邮件中每个链接的抓取工具？

谢谢

我做了同样的事.

$user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
        // Deny access for the BingPreview bot, used by outlook.com on links in e-mails ad Slackbot
        if (strpos($user_agent, 'BingPreview') !== false || strpos($user_agent, 'Slackbot') !== false) {
            header('Status: 403 Forbiden', true, 403);
            exit(1);
        }