In his evidence to the ERA, Mr Vivian apologised for sending the message, and said he had since deleted it and others which contained "derogatory and offensive" comments about Bidvest and the general manager of its Palmerston North branch.
The content of those messages was not disclosed in the ERA's decision, with the authority saying it was "not necessary ... to repeat them", but which Bidvest described as a "tirade of abusive, offensive and abhorrent comments".
The message, which was shown among employees, "immediately spread through the business like wildfire and has been the talking piece of many a lunch and smoko break", Bidvest told the authority.
The breach had the potential to harm the company, it said.
Mr Vivian claimed to have been under pressure since leaving Bidvest, and had been subject to ridicule and harassment during his time at the company.
The reference to "a lot of money" was about his holiday pay and staff account credit, he said. But this was dismissed by the ERA as "highly improbable", as the staff credit amounted to $49.50, and it was "clear" the money Mr Vivian bragged about was a substantial amount.
It concluded he was referring to the $4500 compensation he was paid, and found he had breached the confidentiality agreement.
The ERA ordered Mr Vivian to pay a penalty of $3000, and to comply "with immediate and ongoing effect" to the confidentiality agreement.
Costs were reserved.