I'm not seeing the difference. And I'm not finding anywhere where its explained that way. Your description "multiple semi-permanent forwarding addresses that

I'm not seeing the difference. And I'm not finding anywhere where its explained that way. Your description "multiple semi-permanent forwarding addresses that can be individually disabled as needed due to spam" is exactly how disposable email address services work. In fact I know in sneakemail you can set a particular address to bounce, accept and delete, you can turn on greylisting for it, or you can deactivate it, you can even filter keywords on it.