I'm not sure if I'm missing something here or there is a setting I've not turned on. I am seeing the same users cropping up a few times each day in the bounced email logs. They are showing as email Invalid (bounced) - but the forum is still sending out email notifications of thread updates to these users. Do I have to make any changes to the setup? How will these users know there is a problem when they log in? I've created a usergroup promotion to add the user to unregistered/Unconfirmed while user state is email Invalid (bounced) but this is not working either the users group remains unchanged.