Postal

Postal is a fully featured email delivery platform for running your own inbound and outbound mail service. It provides the core components needed to accept, route, and deliver email for applications and domains, similar in scope to hosted transactional email providers.

Key Features

• SMTP service for sending email from applications and services
• Incoming email handling for receiving and processing messages
• Web-based interface for managing organizations, servers, and domains
• Message tracking and log-style visibility into mail delivery
• Designed to operate as a multi-tenant mail platform
• Installation tooling and scripts available to help bootstrap prerequisites

Use Cases

• Self-hosted transactional email platform for web apps and SaaS products
• Centralized mail infrastructure for multiple domains and teams
• Inbound email processing pipelines (for example, support or app workflows)

Limitations and Considerations

• Requires careful DNS and deliverability setup (SPF/DKIM/DMARC) to achieve reliable inbox placement
• Running production email infrastructure typically requires IP reputation management and ongoing monitoring

Postal is well-suited for teams that need control over email sending and receiving infrastructure while retaining a modern management interface. It offers a practical foundation for operating a SendGrid-like mail service on your own servers.