Originally Posted by
SirJman
Is that the one in the transit area? I believe when you go down to it, you have to reclear security because its on the arrivals (pre-immigration) floor. So just be careful of having liquids when going down there.
I'm not aware of any post office in the transit area. Nor for that matter anywhere airside.
The one mentioned in my post is on the 4th floor in back of the checkin area. This is before immigration and security. As OP is planning to leave the airport anyway the security/liquid scenario should have no bearing here.