Posthorn, self-hosted mail without the mail server

Posthorn is a self-hosted email gateway designed for developers running apps on a VPS, acting as a single Docker container or Go binary that sits between your applications and a transactional email provider. It simplifies email setup by allowing you to configure it once and point all your apps to it, eliminating the need to manage a full mail server. This is particularly interesting for developers who want reliable, outbound email delivery from self-hosted services like Ghost without the complexity of traditional email infrastructure.