Each unit has a mailbox near the main entrance. You should have received a key to open the mail box. If not, please contact your caretaker or RA.
When you receive mail under another name in your mailbox, please return it to the sender. This is the only way to stop the mail from coming in. Just write "Return to sender, person no longer lives at this address" on the envelope and post it in a mailbox. You do not need to stamp it.
Do not forget to deregister from your address at the end of your stay!