Message Regarding the ProtonMail DDoS Attacks

We are happy to announce today that after several days of intense work, we have largely mitigated the DDoS attacks against us. These attacks took ProtonMail offline making it impossible to access emails, but did not breach our security. At present, attacks are continuing, but they are no longer capable of knocking ProtonMail offline for extended periods of time.

https://protonmail.com/blog/protonmail-ddos-attacks/