Answer:
Sends paper without using the post office.
An image taken from real life
What comes down but never back goes up?
I cannot be felt, seen or touched; Yet I can be found in everybody; My existence is always in debate; Yet there is a style of music named after me.
A natural tattoo on babies
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.