@freemo "Man" also means human in it's other meaning,
HUman or MANkind.
(there are more meanings)
It may have been the original meaning (I'm assuming / guessing / relying on history a bit here that all mail personnel were mostly male (say >80% men, even more probably like 99% at some stage) and probably still is a high number... so it's not too bad as a word lasting the changes in human time and human history.
I can guess the post was a joke and a reality etc in one so I'm just focussing on the reality part as many do hear 'man' more than HUman or Man as in MANkind'.
"Man" also means human in it's other meaning, HUman or MANkind...
@ech fair
@freeschool