Async Rust SMTP Engine
An asynchronous, high-throughput SMTP inbound acceptor and outbound relay. Process and route incoming messages at the edge with near-zero latency and minimal resources.
Cryptographic Integrity
Full outbound mail compliance. Maileroo handles bounces with Sender Rewriting Scheme (SRS) and signs outbound messages natively with modern Ed25519 (Elliptic Curve) DKIM.
Reliable Delivery Engine
Never lose a forwarded email. Maileroo queues pending outbounds automatically, executing a robust asynchronous retry loop with exponential backoff.
Open Source & Self-Hostable
100% open source. Maileroo runs on SQLite for light setups or PostgreSQL for production. Deploy on your own server in seconds using Docker Compose.