Kasukabe City: safety-mail subscriber emails leaked at unnamed contractor

The external mail provider detected unauthorized access on 31 October, suspended the service and reported the email leak to the city on 3 November. There were 17,481 registrations at October-end, but the exposed count is unknown. Only emails are registered, excluding names. Recovery remains unscheduled on 4 November; no secondary harm is confirmed. [1] [2]

The report came through the city website manager. Neither that manager nor the mail provider is named, and no source establishes a shared attack with other mail-provider incidents. [1]