I can toggle checkmarks with clicks. Choose Delete marked from the pulldown. Click Go. Prompted to confirm --> Click Yes. And they remain. Log out and back in --> still there. Wait a day and look again --> still there. Delete them, again --> still there. Wait another day and look again --> still there.
That would be fine with me. But, I am trying to negotiate deals and my inbox and outbox are both closing in on 100% full. I could probably move the discussions to email. But, that isn't automatically going to be acceptable to the people I am dealing with.