Anonomi Postbox exists to solve a real constraint of peer-to-peer systems without reintroducing centralized control. Anonomi messages are exchanged directly between contacts. There are no servers. No accounts. No global infrastructure. That model maximizes privacy — but it also means message delivery depends on overlapping availability. In hostile, mobile, or unstable environments, that assumption does not hold. Postbox exists to extend reachability without betraying the threat model. It is not a platform. It is not a service. It is not a convenience layer owned by someone else. It is user-controlled infrastructure. Pure peer-to-peer messaging requires both parties to be online at the same time. When one side is offline, messages stall — sometimes indefinitely. This is not a bug. It is the cost of refusing central servers. But in mobile networks, under power constraints, or in high-risk conditions, availability is inconsistent by default. Postbox addresses this without turning Anonomi into a platform. Anonomi Postbox is a store-and-forward buffer operated by the user, not by a company or network operator. It is: Always online (relative to a phone) Stable (home internet, fixed power) Reachable over Tor Owned and operated by the user Contacts can leave encrypted messages for the postbox owner. The owner retrieves them when they reconnect. No global directory. No shared infrastructure. No third-party custody. Postbox is designed under the same assumptions as Anonomi: Networks are monitored Traffic may be blocked or delayed Devices may be inspected Contacts may be compromised over time As a result: All connections occur over Tor The Postbox has no knowledge of message contents The Postbox does not establish identity The Postbox does not create accounts The Postbox does not become a hub If Postbox cannot be operated safely, it should not be operated at all. Postbox is intentionally limited. It does not: Act as a relay for arbitrary users Provide global reachability Maintain user directories Replace peer-to-peer delivery Introduce push services tied to third parties Postbox exists to extend availability, not to recentralize communication. Features Core capabilities Contacts can store messages for the postbox owner The owner can store messages for contacts to retrieve later All communication occurs over Tor Messages remain end-to-end encrypted Extended / optional components Group message synchronization to increase message circulation Alternative transports (LAN, Wi-Fi Direct, Bluetooth) Push-like wake mechanisms to reduce phone battery drain All extensions are evaluated against the threat model first.