How can I enable other people to access my digital letterbox?

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• Why is my digital letterbox still empty?
• What customers are already sending digital mail?
• I am a business customer who used to use E-Post Office. Where can I now find suitable products for my needs?
• I live with my partner, and we would like to have a single "filing system" that allows us both to access our mail.
• How secure is the ePost Scanning Service, and how does KLARA ensure that the person who receives the mail is the one for whom it was intended and that the mail cannot be seen beforehand (Swiss postal secrecy)?