When I try to delete an email (by right-clicking on the email and clicking on the dustbin in the top right hand corner) the screen empties and I get the message 'No message found'. Then, the only way I have found to get my messages back is to close Thunderbird and open it again. Once I have re-opened the program, I notice that there is an additional - totally unnecessary - sub-folder in my deleted folder. How can I delete emails and stop accumulating subfolders in my deleted bin? With many thanks and best wishes David