Posthorn lets you send transactional email without running your own mail server

Posthorn is a self-hosted tool that handles outbound email by routing through third-party delivery providers, sparing indie developers the pain of managing a full mail server. For solo builders who want data ownership without the operational overhead of Postfix or similar stacks, it's a practical middle ground. Worth watching for anyone tired of paying SaaS email fees but equally tired of fighting spam filters.