Breached using stolen credentials
https://www.bleepingcomputer.com/news/security/royal-mail-investigates-data-leak-claims-no-impact-on-operations/
Royal Mail is investigating claims of a security breach after a threat actor leaked over 144GB of data allegedly stolen from the company's systems.
While the British postal service has yet to confirm that its systems were breached, a spokesperson told BleepingComputer that Royal Mail is aware of an incident at Spectos GmbH, a third-party data collection and analytics service provider.