Benjamin, it sounds like you're running out of space in your mailbox, is that right? The problem may not be old emails in your inbox, but that you haven't actually emptied the trash in a while. Your email trash folder does not delete items automatically - you have to do it manually.
In Webmail, click on the Trash folder in the Table of Contents, select all the messages in the Trash (by checking the box at the top), and then click on the Empty Trash button.
If you're using the installed client from the desktop of your Drew laptop, just right-click on the Trash icon in the Table of Contents and select "Empty Trash."
We'll look into your question about batch forwarding in case emtying the trash doesn't solve your problem.
Student Technology Education Lab
Brothers College Room 6
Facebook: ITS: Drew University Instructional Technology Services