Registered Mail requests a signature from the recipient as proof that your item has been successfully delivered. It includes a tracking number allowing you to see when your item was delivered.
MaltaPost offers 2 additional options
Advice of Receipt - AR (Local & Foreign)
With this added service, you can choose to receive the signature indicating proof of delivery, which is sent to you for your records.
Proof of Delivery (Local Only)
Even if you have not opted for Advice of Delivery, you can still request a copy of the recipient's signature at the time of delivery at a fee of €2.50