In May 2013, Robinson emailed IAG's lawyer and suggested a settlement offer either immediately in confidence or openly through the media.
Two more threatening emails were sent that month. Robinson's threats included using a website to destroy IAG's reputation, unless his monetary demands were met.
Since Robinson's sentencing, a halt on a High Court civil suit he and his wife launched against the company in 2013 has lifted.
It was revealed during a brief hearing before Justice John Faire in Auckland last Wednesday that IAG is applying to strike out the Robinsons' claim.
The case is due to come back before the court later this month.