Hi Ian,
Steve just put his email in the post (his actual email from his account profile as well). The page automatically puts a link on the email to open your mail client (Outlook, Thunderbird, Mac email, etc.). If you don't have an email client and used browser based mail that link won't work.
So... If you had an actual warning from your anti-virus application I'm afraid that can only be one thing. Malware on your PC. Sorry to be the bearer of bad news on that front. Try Malwarebytes to do a scan.
Best wishes,
Jim