How calendar invites work
The new invites feature in Tutanota supports the iCalendar standard for sharing calendar events so that you can share your events with anyone, also with people who are not using Tutanota.
This interoperability lets you share your event with everyone while your encrypted calendar in Tutanota is still protected with end-to-end encryption. Recipients can click to accept the events and automatically add them to their calendars even if they use Google's or Apple's calendars.
Encrypted calendar invites
You can even share the events encrypted to ensure confidentiality. With other Tutanota users, encryption is applied automatically, of course. For all other users, you can use the padlock symbol to encrypt the invite email. If you choose to do this, you need to set a password to external recipients similarly to sending an encrypted email to an external recipient.
Then the recipient gets a notification email, which lets them open the event in the Tutanota client after entering the pre-shared password. From there, they can export the event and import it to their own calendar. However, the events shared via an encrypted email with an external recipient are not added automatically to the recipient's calendar. This is a protection measure to make sure that a confidential event is not leaked to a Google Calendar by accident.
When developing the invite feature, we experimented a lot until we got the final design ready for publication.
Here is a first draft of our new invite feature:
And this how the invite feature looks now, the final version:
Plus, if you look closely, ice cream Tuesday has moved to Monday. Mark your calendars! :)