Answer:
Automail is basically an 'artificial limb', and artificial limbs do exist. They help people that have missing body parts like arms and legs, so that they can still lead a normal life. They are not called 'automail' though. Sometimes these artificial limbs are also called 'prosthetic limbs'.
One of the earliest known prosthetic limb dated back to 300 BC. The prosthetic limb was a leg made of copper and wood. It was found in a grave in Capua, Italy.