Looks like Tutanota is being blocked in Russia. Could you help us narrow this down?
To document the censorship:
1. Install OONI Probe: https://ooni.org/install
2. Tap the link: https://run.ooni.io/nettest?tn=web_connectivity&ta=%7B%22urls%22%3A%5B%22http%3A%2F%2Ftutanota.com%2F%22%2C%22https%3A%2F%2Ftutanota.com%2F%22%5D%7D&mv=1.2.0
3. Tap Run
Results: https://explorer.ooni.org/search?domain=tutanota.com&until=2020-02-16
Thank you!
@grainloom ran the test. Looks pretty blocked to me.
@Tutanota I am in Russia, mail.tutanota.com works fine, but tutanota.com seems to be blocked. I'll try OONI Probe.
@Tutanota they started blocking proton mail so I figured it was only a matter of time
@Tutanota
Blocked. Sick and tired of this crap.
@VikingKong @Tutanota Use Tor Browser with Bridge https://torproject.org
@VikingKong @Tutanota dont they also want to make a wikipedia clone ?
@Tutanota
blocked in Moscow. :(
@Tutanota Tutanota.com is officially blocked in Russia.
Proof: https://blocklist.rkn.gov.ru/
Shame on RKN!
@groosha Thanks for letting us know.
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
@Tutanota
@drq ?