Encrypted email service, Tutanota, has experienced a series of DDoS attacks this week. The attacks targeted the company’s website and further its DNS providers. The company reassured its users that no user data was compromised and that the end-to-end encrypted nature of the service makes it impossible for even the company to access the data. The service to their email service had been restored as of Thursday, September 17th at 7:30 CET. Several emails may have not been delivered and bounced back to the sender.
Source: https://www.bleepingcomputer.com/news/security/tutanota-encrypted-email-service-suffers-ddos-cyberattacks/