TempMail is a self-hosted temporary email service platform that provides disposable email addresses with automatic expiration. The system uses a microservices architecture with separate containers for API (Go/Gin), frontend (Nginx), email reception (Postfix), and email processing (custom LMTP daemon). Key features include domain pool management with automatic MX validation, API Key authentication with rate limiting, OAuth login options, and web-based email management. The platform is optimized for high throughput with innovations like a delivery batcher that groups multiple email writes into single database transactions and a stats flusher that efficiently aggregates in-memory counters.