We have successfully mitigated this weekend's DDoS attacks. If you are still experiencing issues, here's how you can trouble-shoot:
https://www.reddit.com/r/tutanota/comments/iflc59/connection_problems_you_can_help/
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@Tutanota Same deal on OS X as well as needing to symbolic link as per https://rmoff.net/2018/12/08/get-mtr-working-on-the-mac/
