如何阻止Outlook.com跟踪电子邮件中的链接?

As part of account registration I send an email to the new user with a one-time verification link which confirms the existence of their email address and automatically signs them in. However, I've noticed that the verification script is run when the email is opened -- before the link itself is clicked. My assumption is that my email client (Outlook.com in this case) has some sort of crawler which is following the link in the email when it is opened.As part of account registration I send an email