The Earthquake Commission has laid a complaint with Christchurch police that Bryan Staples, the recipient of an accidental email including private customer information, allegedly threatened to use the email to extract preferential payment of invoices.
EQC Chief Executive Ian Simpson said the action was being taken "because the recipient has gone back on his word, and in the process may have broken the law".
"Bryan Staples told EQC today that he will retrieve the email and attachment after providing verbal and written assurances, and a signed Statutory Declaration, that he would delete them.
"The confidential information was released by mistake. We have apologised for that and we are determined not to add to any distress already caused by the mistake", Mr Simpson said.
Mr Staples - an insurance advocate and former EQC employee - sent an email advising EQC that if the commission paid particular accounts "in full within the required time frame, there will be no media announcement and the matter will die a natural death".