I was wondering how to add a phone number and an alternative email for password recovery after creating an account.
According to the password recovery support page, it only says "...when creating your account...".
I don't know exactly how the category is called in the English interface, but if you go into Settings > mailbox.org there should be something like personal data ("Persönliche Daten" in German). And in this category you can add recovery information in the lower part of it.
Thanks! That worked for me!
Mailbox.org should put it in the support article though!
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