Mbox File Parser for Node.js

The `node-mbox` library (current stable version 2.0.0) provides a fast, stream-based parser for mbox email archives in Node.js environments. It is designed to efficiently process large mbox files, reportedly handling 1.5GB in about 20 seconds. The library differentiates itself by focusing specifically on the mbox file structure parsing, emitting individual email messages as `Buffer` instances, rather than attempting to parse the intricate content of the email messages themselves (a task typically handled by companion libraries like `mailparser`). Version 2.0.0 introduces a completely new API, shifting towards a more idiomatic Node.js stream approach and allowing for custom line splitting technologies. While generally robust, it notes that it is not 100% compliant with RFC 4155, which is an important consideration for strict RFC adherence. Its release cadence appears to involve significant API revisions between major versions.