There are ongoing attacks and issues with our network which may lead to intermittent connectivity problems.
Services have been online and stable all day today and attacks are being successfully mitigated. We have posted a longer update here: https://old.reddit.com/r/ProtonMail/comments/8uu9t7/update_regarding_the_ddos_situation/
Posted 3 weeks ago
Attacks may still continue later on, but mitigation is working well and there should not be much user impact, just as there was limited user impact for most of the attacks earlier today.