No, there is no post office at the terminal.
Post boxes are available on Level 0 near WHSmith, and inside the Departures Hall.
Furthermore, MaltaPost Easipik Parcel Pick-Up Service are available 24/7 at the entrance tunnel on level -1.
The Easipik locker is conveniently located within the entrance tunnel, making it easy for you to collect your parcels whenever it suits you, before work, after your shift, or even late at night.