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 providers, so you get the control of self-hosting without the pain of managing SMTP infrastructure. For indie makers who want ownership over their email pipeline but dread DNS records, spam filters, and server maintenance, this is a practical middle ground. It's the kind of unglamorous tooling that quietly makes solo projects more viable.