Are you using the GroupWise program or accessing your mailbox via Webaccess?
Assuming you are using a Drew configured computer, the GroupWise program was installed on your computer. Using that is the best way to deal with a mailbox that is full. You can use the Tools -> Check Mailbox size option to identify the largest messages in your mailbox, and delete those that aren't needed.
If you just want to empty everything in Trash, right-click on your Trash folder and choose Empty Trash.
If you are trying to empty messages in Trash via Webaccess (http://webaccess.drew.edu
) , and are running into problems, try selecting groups of messages in your Trash folder use the 'Empty Selected Items' button instead of using the 'Empty Trash' button.