Ah...so simple. Thanks.
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
Even easier...
Go to this page -> http://www.scubaboard.com/forums/profile.php?do=editoptions
Then uncheck this box and you should stop receiving email notifications until you re-check it.