How do I delete my Groupwise emails?

Open Groupwise
Select the message you want to delete in the right pane
Click on the garbage can icon or right-click and go to Delete

If you want to delete more than one message at a time, you can click on each message you want to delete while you hold down the <Ctrl key>
When you have them all highlighted, click on the garbage can icon or right-click and go to Delete

Deleting emails just sends them to your trash can
To empty the trash, go to Edit, Empty trash (once you do this, they are gone!)