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But if Tutanota states open source mail client, people will think Tutanota is some sort of email application like K-9 Mail or Thunderbird.
We should get in touch with them and tell them to change the description to something else which is not misleading.
this is where an asterisk would come in handy, I guess… An “our web client is open source but our backend is not” probably wouldn’t work either, since it’s lengthy