[Michael Adams (mdawaffe)]

You can hook into the bb_new_user hook (see bb-includes/register.php: bb_new_user() ), but by the time that hook is fired, the user is already in the database, and the new user has been sent an email.

In the next version of bbPress, you’ll be able to hook into bb_verify_email(). (https://trac.bbpress.org/changeset/549)