Yes, e.g. outlook replaces links in mails so they can scan the site first. Also some virusscanners offer nail protection, checking the site that’s linked to first, before allowing the mail to end up in the user’s mail client.
Thats why you never take actions on a GET request, but require a form with button for the user to do a POST.
Now the dev doesn’t need to comment this part of the code, saves him time.