bitkasten is a free Android application developed by bitkasten AG. It is a digital mailbox that allows users to receive and store their mail digitally. It works just like a physical mailbox, where the postman delivers mails from senders, but in this case, all mails are delivered digitally to the bitkasten.

With bitkasten, users can access their mails at any time and from anywhere in the world. All documents are stored digitally in one central location, making it easy to retrieve and manage them. Additionally, bitkasten provides a lifelong archive for storing important documents. The best part is that the service is completely free for post recipients.

Overall, bitkasten is a great solution for those who want to reduce their carbon footprint and prefer digital communication. It is a convenient and easy-to-use application that ensures all your mails are stored securely in one place.