Letterbox is an Android application built with Jetpack Compose that opens and inspects .eml email files. It delegates parsing to a Rust core library (exposed via UniFFI and JNA), renders message bodies and attachments, and keeps a local, deduplicated history backed by Room or an in-memory store for tests.

Key capabilities

- Opens .eml files shared via ACTION_VIEW and ACTION_SEND intents declared in app/src/main/AndroidManifest.xml.
- Parses messages through the letterbox-core Rust crate using