At the moment, if a member is marked as "e-mail invalid (bounced)" they switch to use guest permissions, which may mean read-only mode for most forums, or it may completely change the forum experience if things are customised. Instead of this, it would be preferable to have an option to not force a change of permissions. I would rather use the notices system to nudge members to correct their e-mail address, but not stop them from interacting with the forums. I can use the promotions system to move members to an alternate usergroup if I do want to limit things. The current setup is quite inflexible, which is out of character for the rest of the software - I like being able to customise things using permissions/notices/promotions etc... Of course, stopping e-mails being sent to the invalid address should still be enforced - everything else can be optional using existing methods. Could this be considered as a option for a 1.4.x point release, as it's not a huge change - but will have a big impact on how the powerful bounce system can be used.