When you post, immediately beneath the text window is a drop down list that by default says "Instant notification by email", click the drop down and set to "No Subscription" if you don't want to receive a mail every time there's a new post.
Go to your profile and look up your subscriptions and you can then delete all the subscriptions you have made in other posts. Then go to Options and you can reset your defaults as to when you will/won't receive emails from the caf.