PostBox — Secure Digital Mailbox
A secure digital mailbox with Signal-protocol end-to-end encryption for sensitive document delivery between organizations and individuals.
The Challenge
Organizations needed to deliver sensitive documents to individuals without trusting the transport or the server in between — email was insecure, and portals leaked metadata.
Our Approach
We built PostBox around the Signal protocol for true end-to-end encryption, so documents are unreadable to the server and to anyone on the wire. A clean mailbox UX keeps it usable for non-technical recipients while preserving forward secrecy.
The Outcome
A digital mailbox where organizations deliver confidential documents with Signal-grade guarantees — the server never sees plaintext.
More from Enterprise & Workflow Systems
Related work
Need something similar?
Tell us about your project and we'll share how we'd approach it.