When in the email app, press the menu key, press delete, press the menu key again, press "mark all", press "Delete".
When I delete an e-mail message, it goes into the Trash folder. Is there any way to highlight all of the messages and delete them? Or do I have to check each one and then delete? It seems to be double work, as I have to check and delete each message in the Inbox and then do the same thing in the Trash box.