In New York in the 1950s was "The Merry Mailman" starring Ray Heatherton (father of Joey Heatherton):
I am the Merry Mailman,
Ding Ding! Your bell will ring,
That's my very special ring
And this is what I'll bring:
A letter from your grandma
To say she's coming to stay.
Then close your eyes for the big surprise,
It's a present for your birthday.
I am the Merry Mailman...
(i forget the rest)