There are no maps that I can point anyone to. The only thing I could find was originally in the passenger guide PDF, but a search for CTT (who is the national postal service) found some more information. Unfortunately, it’s listed as a financial service and not a postal service.
There’s a post office in the departures area, pre-security Terminal 1. Look for CTT. Check for the Web page for more details.
Last updated 16 July 2017