Is there a post office in the Orlando airport?

Not that am aware.

I didn't see one but the airport is huge so I'm pretty sure they have a mailbox

There is a mail drop-box opposite the bank in Terminal A, but no postal services; however, there is a large post office off Tradeport Drive on the west side of the airport property (not within walking distance of the terminal).

Not completely sure but I’ve never seen one.

I've never seen something like that

I dont think so