Neverending chain of mailmen

[Oralee]

Spongebob once asked this question on his show, and ever since then, this is the question that everyone has been asking lately:
Do mailmen deliver their own mail? Or is there a [neverending chain of mailmen] delivering mail to other mailmen?
Nobody really knows the answer, except, of course, for the mailmen themselves, but they choose to keep the answer confidential for some unknown reason. Or maybe they just never [got around] to answering it.
The next time you see your [mailman], please ask them this question.