postalserver/postal
Postal
Postal is an open-source mail delivery platform designed for self-hosted sending and receiving of email using standard mail transfer protocols. It serves as a comprehensive email infrastructure that provides full delivery tracking and management of outgoing mail streams.
The system includes an SMTP server manager with a web administration interface for configuring server settings and monitoring delivery status. It distinguishes its outbound traffic management through priority-based IP rotation and assignment to help maintain sender reputation.
The platform covers incoming email processing and routing, asynchronous mail queue management, and spam filtering using configurable thresholds and external tools. It also incorporates security features such as SHA256 request signing for outgoing HTTP requests and OpenID Connect for identity management.
The software is provided as a container image with orchestration for its database dependencies and supports configuration via environment variables.
Features
- Email Delivery Infrastructure - Offers a self-hosted infrastructure for sending emails from websites and servers to external recipients.
- Self-Hosted Email Delivery Platforms - Provides a complete, open-source platform for self-hosting the sending and receiving of email messages.
- Incoming Message Routing - Processes received email messages and routes them to appropriate internal or external destinations.
- Mail Delivery Agents - Employs mail delivery agents and background workers to handle asynchronous routing and delivery.
- Message Queue Workers - Uses background worker processes to decouple email reception from final delivery via asynchronous queuing.
- Email Senders - Routes emails from applications to external recipients while optimizing sender reputation and IP priority.
- Email Systems - Hosts mail servers that receive external mail streams and route them for automated handling or storage.
- Email Delivery Services - Provides a full-scale system for transmitting email messages to external recipients via standard transport protocols.
- Incoming Email Processors - Implements a routing engine that receives incoming messages and handles them for automated internal processing.
- Mail Servers - Serves as a comprehensive open-source mail server for sending, receiving, and managing electronic mail.
- Outbound IP Rotation - Manages sender reputation by rotating outbound IP addresses based on a weighted priority list.
- SMTP Routing - Handles the core reception and transmission of email using the standard SMTP protocol.
- Email Filtering - Includes built-in mechanisms for scanning and blocking unsolicited email using configurable thresholds and external tools.
- Spam Filtering - Identifies and blocks unsolicited email using configurable thresholds and external spam filters.
- Containerized Platforms - Provides a complete mail platform packaged as a container image with integrated database orchestration.
- Server Management Interfaces - Provides a web interface for configuring outgoing mail streams and managing sender reputation across IP addresses.
- Administrative Interfaces - Includes a web-based dashboard for managing server configurations and monitoring real-time delivery status.
- Delivery Monitoring - Tracks real-time operational metrics and queue latency to monitor email delivery health.
- Server Metrics - Provides a dedicated internal server for exposing real-time operational metrics and system health data.
- Backend and Infrastructure - Mail delivery platform for transactional emails.
- Open Source Applications - Mail delivery and SMTP platform.
- Email Solutions - Full-featured mail server for websites and applications.
