NTT DATA Mathematical Systems: a list of 10,000 customers was attached by mistake to an event email, sending names and email addresses to 2,000 recipients

1. 2021-02-26

   The company announced the case. [2]

2. 2021-02-26 15:00

   Around this time, while sending an email about an event it hosted, the company attached the CSV file of the recipient list by mistake. It was sending in batches of 1,000 and stopped after 2,000 when it noticed. [1] [2]

The list covered 10,000 customers who had exchanged business cards with staff or registered their contacts at events and on the website: company names (corporate names only), names and email addresses. About 2,000 recipients were able to see the details of other customers. [1] [2]

The company contacted and apologized to the customers concerned and asked those who received the list to delete the file. It is considering measures to prevent a recurrence. [1] [2]