This is a new feature, Trevor, so it may not work retroactively. Let's be patient. Just make sure that the tick-box is unchecked for all new forum posts you make, and the emails should not arrive.
Also, the best solution by far is to set up a simple filter in your email account that will automatically transfer these incoming emails to a separate folder. That's how I do it. That way, WGT emails don't interfere with my work-related and private emails. And it's great to be able to see, at a glance, in that special folder, all new replies that have been sent to these forums, without having to visit the forum webpages. It's a much faster way to skim through new forum posts than having to read them on many different webpages here at WGT.com.
(Submitting a fake email address would be a bad idea. You'd stop receiving all legitimate notifications from WGT, including those on upgrades, your tournament participation, etc. You'd no longer get notifications about new Wall posts and Private Messages, etc. etc.)