Provider One Data Breach (2018)

energy supplier One sends an e-mail to customers with the note that new mail is in the online service portal of the one. This is customary in business transactions when customers only carry out their contract processing, including invoice receipt, online. The problem with this one-e-mail: It was sent with an open mailing list, that is, the e-mail addresses of 20 customers were freely visible. Like telephone numbers or addresses, e-mail addresses are considered as personal data and may only be given to third parties with the consent.