docker-mailserver/docker-mailserver

Features

• Mail Servers - Provides a complete mail transfer agent and delivery system within a containerized environment.
• Self-Hosted Infrastructure - Enables private, full-stack email hosting with support for standard protocols and secure delivery.
• Persistent Storage Volumes - Mounts dedicated storage volumes to ensure email data remains available outside the container after restarts.
• Email Filtering - Applies custom rules globally or per-user to automatically sort, redirect, or discard messages.
• Email Signing - Signs and verifies email messages using cryptographic standards like DKIM.
• Kubernetes Orchestration - Orchestrates mail services within clusters using standard manifests for configuration and storage.
• Server Configuration Management - Simplifies management of accounts, aliases, and system parameters via a dedicated command-line utility.
• Directory Service Integrations - Integrates with external LDAP and identity providers to centralize user authentication.
• Mail Transmission Security - Enforces encrypted mail delivery protocols to protect data in transit.
• Backend Security Middleware - Integrates modular scanning and filtering engines into the mail delivery pipeline for spam and malware analysis.
• User Account Management - Provides command-line tools for creating, deleting, and securing email accounts.
• User Authentication Strategies - Authenticates users against local or external providers to control access.
• Email Services - Full-stack mail server suite containerized for easy deployment.
• Email Solutions - Listed in the “Email Solutions” section of the Awesome Selfhosted awesome list.
• Configuration Persistence - Maps external directories to internal paths to ensure mail server settings persist across container lifecycles.
• Persistent Storage Management - Enforces global limits on mailbox sizes and configures storage formats for managed mail data.
• Persistent Volume Mapping - Maps internal application directories to host storage to ensure mail data and configuration persistence.
• Container Orchestration Management - Bundles multiple independent mail services into a single container environment with unified supervision.
• Mail Delivery Agents - Supports multi-tenant relay routing and sender-dependent gateways for complex delivery requirements.
• Alias Management - Redirects incoming mail for specific addresses to local accounts or external destinations using static mappings or regular expressions.
• State Persistence - Maintains persistent storage for filtering data and learned patterns to ensure consistent performance.
• Automated Container Updaters - Monitors and automatically updates container images to ensure the mail server runs the latest version.
• IMAP Services - Provides secure access for email clients to fetch messages using encrypted IMAP connections.
• Mail Protocol Implementations - Operates standard network services for sending, receiving, and retrieving messages.
• Outbound Mail Relays - Delegates the delivery of outgoing emails to external services or relay hosts.
• Sub-addressing Extensions - Automatically organizes incoming messages into folders by parsing tags from recipient addresses.
• Brute Force Protections - Protects against brute-force attacks by monitoring logs and blocking suspicious IP addresses.
• Identity Federation Providers - Validates user credentials against external identity providers using tokens for centralized access control.
• Message Encryption - Encrypts stored email messages at rest to ensure data privacy.
• Server Administration - Provides administrative commands against running containers to simplify configuration and maintenance.
• Usage Quota Managers - Enforces disk usage limits on individual mailboxes to prevent system-wide storage exhaustion.
• Shell Script Execution Engines - Executes user-defined shell scripts during container startup to patch configurations before services initialize.
• Sender Identity Verifications - Restricts users to sending mail only from authorized addresses to prevent spoofing.
• Email Forwarding Rules - Redirects incoming messages to external addresses using alias rules instead of local storage.
• Mail Routing Policies - Processes outgoing mail from local users and accepts incoming mail from third-party servers.
• Proxy-Aware Routing - Supports reverse proxy configurations and header preservation to maintain accurate client IP visibility.
• Relay Server Configurations - Routes outbound mail through specific relay hosts based on the sender domain.
• Administrative Account Management - Provides master account access for administrative maintenance and mailbox management tasks.
• Authentication Security Policies - Defines security policies for handling incoming mail that fails authentication checks.
• YAML Configuration Files - Allows granular tuning of mail transport parameters by mounting external configuration files.
• Automated Server Maintenance - Manages background services including log rotation, update checks, and automated mail retrieval.
• Real-Time Monitoring Dashboards - Exposes a web-based dashboard for viewing real-time filtering data and security statistics.
• System Services - Ensures mail server containers automatically start at boot and remain active as persistent system services.

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