test4 (and others interested) to NOT notify a user about their own post try this (untested):
around line 16:
change
if ( notification_is_activated( $userdata->ID ) ) :
to
if ($bb_current_user->ID!=$userdata->ID && notification_is_activated( $userdata->ID ) ) :
This could also be accomplished via the function notification_select_all_users during the mysql query by excluding the current user.
This (should) work because the person making the post is the one triggering all the emails.
