There is an upstream network incident, our team is currently investigating.
We are experiencing some backend issues at this time and our infrastructure team is working on it.
We are currently experiencing delays in incoming mail. Our engineers are checking and we will update with more information when it becomes available.
A network issue has occurred due to unexpected maintenance upstream. Our team is working on restoring connectivity through a backup site.
Attacks might continue, but are being mitigated and the service is restored for all users. We've also made some hardware changes in our datacenter to improve resiliency.
We are constantly updating the first comment of the discussion found on our Reddit page here: https://www.reddit.com/r/ProtonMail/comments/8uu9t7/update_regarding_the_ddos_situation/
New attack has started and we are working on mitigation.