Mr Day gave Justtin [sic] Smith, 47, of Tobruk Crescent, a custodial sentence when he appeared in Orange Local Court for intending to pervert the course of justice.

"This is a serious attack on our system of criminal justice," Mr Day said.

"It strikes at the heart of the system."

According to police, Garry Henry Hay, had been charged with six counts of stalking or intimidation for writing threatening letters and a hearing was scheduled for June 18, 2019.

However, six days before the hearing date, Smith attended Forbes Police Station and said he wrote the letters.

Smith was taken into custody and participated in a police interview and said he wrote the letter and sent a Facebook message to the victim's partner.

However, Solicitor Dannielle Ford said Smith admitted in the police interview that he did not write the letters.

"Mr Smith did not lead the police down the rabbit hole, during the police interview where police were preparing the statements he realised he was acting dishonestly and he admitted to it in that same interview," Mrs Ford said.

She said Smith had not read the offensive messages to a state government employee from Family and Community Services and she said Smith had no prior criminal record.

"[He] felt pressured to give information to police, he had no knowledge of the situation," Mrs Ford said.

"He feared for his and his family's safety by the actual accused."

However, Mr Day said Smith did not tell police that Hay threatened him to give a false story.

"I'm trying to decide why a person of your client's age would even think about incriminating himself for someone else's offending," Mr Day said.

Smith was given a 12-month community-based intensive correction order and 75 hours of community service.

"The mastermind behind it got exactly what he deserved, a two-and-a-half year head sentence," Mr Day said.