postal

Supports both outgoing and incoming email processing, providing a full-stack solution similar to commercial services like SendGrid, as highlighted in the README.

Offers enterprise-grade features without vendor lock-in, allowing full customization and control over email infrastructure, aligning with its philosophy of transparency.

Includes a web-based administration interface for configuration, tracking, and analytics, simplifying management as described in the key features.

Built to handle varying email volumes for websites and applications, ensuring it can grow with your needs, per the scalability feature.