$ show axllent/mailpit
Mailpit is an email testing tool that functions as an SMTP server with a web interface and API for inspecting and testing emails. The architecture is a monolithic Go application that includes an SMTP server (port 1025), POP3 server (port 1110), HTTP server for web UI and API (port 8025), WebSocket server for real-time updates, and an embedded Vue.js frontend. Key entry points are main.go (application entry), cmd/* (CLI commands), and sendmail/main.go (sendmail replacement). Primary data flows involve email ingestion via SMTP/storage, parsing with enmime, storage in SQLite/rqlite, indexing for search/tagging, and retrieval via HTTP/WebSocket for UI/API consumption. External dependencies include Go modules (enmime, sqlf, goquery, etc.) and npm packages (Vue.js, Bootstrap, axios) for the frontend.
The LLM identified 3 files worth highlighting for reuse:
Implements a compact, URL-friendly UUID generator using base57 encoding that avoids ambiguous characters (0, O, 1, l, I). Self-contained with only standard library dependencies, thread-safe via atomic operations, and includes comprehensive tests. Easily extractable for any project needing short, collision-resistant IDs.
Provides a thread-safe token bucket rate limiter for controlling request rates (used in link checking). Uses atomic operations for concurrency safety with zero external dependencies beyond the standard library. The pattern is broadly applicable for API rate limiting, web scraping, or any resource throttling scenario.
Generates self-signed TLS certificates for testing purposes using only the standard library. Handles certificate creation, key generation, and encoding to PEM format. Useful for setting up test TLS servers without external dependencies like OpenSSL or CFSSL.