Stuart had alleged Smith had pressured the complainant to drop the charges, through February and March 2016.
However, in his closing address Smith's defence lawyer Richard Stone told the jury the complainant had plenty to gain from saying the letters were a lie, as he was being charged with attempting to pervert the course of justice based on his original statement.
Stone told the jury the complainant had admitted during questioning that he would lie when his "back was against the wall" or when he wanted to "hurt someone."
Crown Prosecutor Cam Stuart had told the jury in his closing address that the only person to benefit from the original charges being withdrawn was Smith.
He alleged Smith had bribed the complainant by offering him a deal on a car, and also threatened him by saying he would bring the complainant down with him if he did not withdraw the charges.