They don’t have information about the content of the mails, but same as any other mail provider the account data and the IP, this is the data which they can provide to the police. The rest are informations from the ISP and from own investigations of the police itself. Because of this the title that “Proton discloses user data leading to arrest in Spain” is somewhat sensationalist.
except they told users in the past that they dont have this informaion
They don’t have information about the content of the mails, but same as any other mail provider the account data and the IP, this is the data which they can provide to the police. The rest are informations from the ISP and from own investigations of the police itself. Because of this the title that “Proton discloses user data leading to arrest in Spain” is somewhat sensationalist.