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Duration 21 hours
Course Outline
Introduction to Stalwart
- Overview of Stalwart and its design rationale
- Single Rust binary architecture
- Comparison with traditional mail stacks
- Licensing details: AGPL-3.0 and Enterprise options
Installation and Initial Setup
- System requirements and supported platforms
- Installing via Docker and Docker Compose
- Installing from binary on Linux
- Selecting the database backend
- Using bootstrap mode and the setup wizard
Core Protocols and DNS
- Configuring SMTP for inbound and outbound traffic
- Accessing mail via IMAP4 and JMAP
- Supporting legacy clients with POP3
- Setting DNS records: MX, SPF, DKIM, DMARC
- Automating DKIM key rotation
Security and Authentication
- Implementing TLS with ACME certificate provisioning
- Utilizing DANE and MTA-STS for transport security
- Configuring authentication backends: internal, LDAP, OIDC, SQL
- Setting up OAuth 2.0 and two-factor authentication
- Managing access control lists and permissions
- Applying rate limiting and automated IP blocking
Spam and Phishing Protection
- Understanding the built-in spam filter architecture
- Classification via AI and LLM-driven models
- Using statistical Bayesian classifiers
- Integrating DNS blocklists and Pyzor
- Implementing greylisting and spam traps
- Protecting against phishing and homographic attacks
Storage and Search Backends
- Storage options: RocksDB, PostgreSQL, MySQL, SQLite
- Cloud blob storage integration with S3 and Azure
- Caching strategies using Redis
- Full-text search: built-in features versus external engines
Collaboration Services
- Managing calendars via CalDAV and JMAP
- Handling contacts with CardDAV and JMAP
- Storing files using WebDAV
- Sharing resources via ACLs and JMAP Sharing
Multi-Tenancy and User Management
- Isolating domains and tenants
- Managing user accounts and groups
- Administering mailing lists and aliases
- Configuring subaddressing and catch-all addresses
- Setting disk quotas per user and tenant
Administration and Monitoring
- Using the WebUI dashboard and statistics tools
- Utilizing the CLI for scripting and automation
- Managing the SMTP queue
- Tracking metrics with OpenTelemetry and Prometheus
- Automating events through Webhooks
Clustering and High Availability
- Coordinating peer-to-peer clusters
- Implementing clustering with Kafka and Redis
- Setting up read replicas and sharded storage
- Deploying on Kubernetes
- Designing for fault tolerance
Advanced Configuration
- Writing scripts using the Sieve language
- Integrating MTA hooks and milters
- Defining routing rules and virtual queues
- Performing envelope rewriting
Migration and Integration
- Migrating from Postfix and Dovecot
- Migrating from Exchange
- Configuring Autoconfig and Autodiscover
- Managing DNS automatically
- Deploying via API-driven declarative methods
Requirements
- Proficiency with the Linux command line
- A foundational understanding of DNS concepts
- Basic knowledge of email fundamentals is beneficial but not mandatory
Target Audience
- System administrators
- DevOps and platform engineers
- IT infrastructure specialists
- Professionals managing or planning self-hosted email deployments
