To help solve your problem:
click on MY PROFILE;
click on ACCOUNT DETAILS;
you'll see part one containing BASIC INFORMATION;
just below that is EMAIL PREFERENCES;
you can set your subscriptions to SITE ONLY and this will end the emails for replies to all subscribed threads.
This will show a dark red box when you go to MY PROFILE, to the left of any thread you are subscibed to if there is a new reply which you have not read.
I'm not sure if there is a way to stop email notifications other than going through those steps, or if there are options which allow only some email notifications. I prefer to use no wmai lnotifications for all subscriptions. I check in daily here, so I don't miss much of interest.
If you bookmark your profile page after you have your personal preferences selected, you can click on that bookmark in your web browser and have instant access to your subscribed threads as well as personal message notification.
Enjoy the forums!