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title = "Concepts"
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template = "documentation.html"
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## Goals

## Main concepts

[Per-user encryption](@/documentation/design/per-user-encryption.md) - TODO

[Unbreakable mailboxes](@/documentation/design/unbreakable-mailboxes.md) - TODO

**Modular design** - Login and Mailbox storage is abstracted behind an interface: multiple
implementations are thus possible.

**Micro-service** - Stateless. 12 factor app.