They're not opting in though; I had a huge fight with Yahoo over it; by checking the box for them by default they're not taking the action to opt in directly by themselves...
Automatically adding things to a "Watch List" is one thing, emailing every time a reply to something added to your Watch List is another thing.
See
https://www.ubbcentral.com/forums/ubbthreads.php?ubb=editdisplayBy default should anything added to your Watch Lists be emailed to you?Yes/No
On a fresh install of UBBT 7.5.8, the default email notification is "No"
EDIT: I do agree with Bella, regarding that all new posts and replies should be added to the user's watch list by default -- but emailing these replies should be checked-OFF/set as NO, by default. And this should be a mandatory questions asked during the New User Registration screen.
