Since there is no way to scroll back to read the older emails, wouldn't it be nice to have a button to select all in the email in that particular page. This will let us to deleted those email that we found useless per page.
Here are some other idea for email box improvement option.
A search function
A previous button to view the older emails
An email list to email to a set of predefined players
Maybe a friend list that would utalize our existing friendlist
This implementation would a nice break from all those main project our admin are working on at the moment.