The DDoS attack on ProtonMail started somewhere on Tuesday morning. ProtonMail immediately tweeted that it was experiencing a DDoS attack and that it anticipated some of its services would become temporarily unavailable.

— ProtonMail (@ProtonMail) November 3, 2015 ProtonMail stated that it has been working with its data center to respond to this attack. It said that the DDoS attack which hit ProtonMail servers, came in four different attacks. Since there was no letup between this attacks, the datacenter could not recover from the attack.

— ProtonMail (@ProtonMail) November 5, 2015 Notwithstanding persistent issues of availability over the past few days, the email provider has published a blog post explaining what has transpired so far and what it it is doing to restore its services: ProtonMail also stated that the DDoS attack has not compromised their email security in any way. The encrypted email service is currently looking for another data center in Switzerland to host it, though “many are afraid due to the magnitude of the attack” against it.

— ProtonMail (@ProtonMail) November 5, 2015 ProtonMail has asked all its users follow its Twitter feeder to receive regular updates regarding when the service will be live again.