http://www.smh.com.au/it-pro/securit...223-1p8us.html

Each year the registrar is obliged by the Internet Corporation for Assigned Names and Numbers (ICANN) to send a reminder to customers to ensure it keeps registrant information up to date for each registered domain.

It began sending the notifications to 350,000 customers in batches on Thursday, before it realised one of the batches had been emailed to customers other than the relevant domain owners or their representatives.