Immigration New Zealand is the latest government agency to breach the privacy of clients, says Labour.
The party's immigration spokeswoman, Darien Fenton, said immigration officials last week sent two emails with client email addresses to more than 200 advisers, lawyers and individuals.
It follows a Government shutdown of the Earthquake Commission's email systems after privacy breaches there.
Ms Fenton said the Government needed to move urgently to introduce a cross-agency solution to ensure every New Zealander's private information was safe.
"This incident comes on top of the public scandals of privacy breaches by state agencies including EQC, Work and Income, Inland Revenue and ACC," Ms Fenton said.