Yesterday's outage was caused by attacks on our DNS providers. These attacks against have been completely out of our control, but we've managed to switch to a new provider. We thank everyone for your patience and continuous support!
https://tutanota.com/blog/posts/ddos-dns-attack

@Tutanota Cashed = cached. Someone really has it in for you don't they! Good job getting things back up and running swiftly.