Verify the authenticity of any email by checking Recent Official Emails Sent by WTS. If you do not see the email listed there, do not respond to it before verifying with WTS that it is a legitimate email.
You can make sure that you are visiting the real page posted by Western WTS (and not a well-crafted forgery) by hovering over the link and verifying that the site starts with http://www.uwo.ca/wts/.
Recent Phishing Emails on Campus
DO NOT respond to these or any email that looks similar