Self-Hosted Email Campaign Delivery & Tracking — Postal vs Listmonk vs Mailtrain

Sending email at scale without relying on third-party SaaS platforms requires dedicated infrastructure. Whether you’re running a newsletter, transactional email system, or marketing campaigns, self-hosted email delivery platforms give you full control over sending infrastructure, subscriber data, and delivery analytics.

In this guide, we compare three self-hosted email campaign delivery and tracking platforms: Postal, Listmonk, and Mailtrain. While our email marketing comparison focuses on marketing features, this article emphasizes the delivery infrastructure, tracking capabilities, and analytics that power high-volume email operations. For organizations building SMTP relay infrastructure, see our SMTP relay guide for complementary deployment options.

Email Delivery Infrastructure: What Matters

A self-hosted email delivery platform needs to handle three core functions:

1. Message injection — accepting emails from applications, APIs, or web UIs
2. Delivery management — queue management, rate limiting, bounce handling, and retry logic
3. Tracking & analytics — open tracking, click tracking, delivery reports, and engagement metrics

The three platforms we compare each approach this stack differently. Postal is a full mail server with delivery tracking. Listmonk is a newsletter and campaign manager with built-in tracking. Mailtrain is a Mailchimp alternative with list management and campaign analytics.

Comparison Table

Postal

Postal is a complete mail delivery platform — essentially a self-hosted alternative to SendGrid or Mailgun. It handles the full email lifecycle: accepting messages via SMTP or API, delivering them to recipients, tracking opens and clicks, and processing bounces.

Key strengths:

• Full mail server — receives AND sends email
• Per-message tracking with detailed delivery logs
• Automatic bounce processing and suppression lists
• Organization-level multi-tenancy (reseller-ready)
• Webhook integration for real-time delivery events

When to use: Teams needing a complete mail delivery infrastructure to replace SendGrid/Mailgun with full control over sending domains, IP reputation, and delivery analytics.

Docker Compose Deployment

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version: '3.8'
services:
  postal-mysql:
    image: mariadb:11
    container_name: postal-mysql
    environment:
      MYSQL_ROOT_PASSWORD: postal-root-password
      MYSQL_DATABASE: postal
      MYSQL_USER: postal
      MYSQL_PASSWORD: postal-password
    volumes:
      - postal-mysql-data:/var/lib/mysql
    networks:
      - postal-network

  postal-rabbitmq:
    image: rabbitmq:3-management
    container_name: postal-rabbitmq
    environment:
      RABBITMQ_DEFAULT_USER: postal
      RABBITMQ_DEFAULT_PASS: postal-rabbitmq-password
    volumes:
      - postal-rabbitmq-data:/var/lib/rabbitmq
    networks:
      - postal-network

  postal:
    image: ghcr.io/postalserver/postal:main
    container_name: postal
    depends_on:
      - postal-mysql
      - postal-rabbitmq
    ports:
      - "5000:5000"
      - "2525:25"
      - "8025:8025"
    environment:
      POSTAL_CONFIG_MAIL_SERVER_SMTP_HOST: "postal"
      POSTAL_CONFIG_GENERAL_WEB_SERVER_HOST: "0.0.0.0"
    volumes:
      - postal-config:/opt/postal/config
    networks:
      - postal-network
    restart: unless-stopped

volumes:
  postal-mysql-data:
  postal-rabbitmq-data:
  postal-config:

networks:
  postal-network:
    driver: bridge

Listmonk

Listmonk is a self-hosted newsletter and mailing list manager with a focus on performance and simplicity. It handles subscriber management, campaign creation, template rendering, and engagement tracking — all through a clean web interface and REST API.

Key strengths:

• High-performance sending (millions of emails per hour)
• Subscriber management with custom attributes and segmentation
• Templating with Go templates and HTML support
• Built-in analytics dashboard (opens, clicks, bounces, unsubscribes)
• Lightweight — single Go binary with PostgreSQL

When to use: Teams running newsletters, product updates, or transactional email campaigns who want a lightweight, high-performance mailing list manager.

Docker Compose Deployment

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version: '3.8'
services:
  listmonk-db:
    image: postgres:16-alpine
    container_name: listmonk-db
    environment:
      POSTGRES_DB: listmonk
      POSTGRES_USER: listmonk
      POSTGRES_PASSWORD: listmonk-password
    volumes:
      - listmonk-db-data:/var/lib/postgresql/data
    networks:
      - listmonk-network

  listmonk:
    image: listmonk/listmonk:latest
    container_name: listmonk
    depends_on:
      - listmonk-db
    ports:
      - "9000:9000"
    environment:
      LISTMONK_app__address: "0.0.0.0:9000"
      LISTMONK_db__host: listmonk-db
      LISTMONK_db__database: listmonk
      LISTMONK_db__user: listmonk
      LISTMONK_db__password: listmonk-password
      LISTMONK_db__ssl_mode: disable
    volumes:
      - ./listmonk-config:/listmonk/config
    networks:
      - listmonk-network
    restart: unless-stopped

Initialize the database:

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docker compose run --rm listmonk ./listmonk --install
docker compose up -d
# Access: http://localhost:9000
# Default: admin / listmonk

Mailtrain

Mailtrain is an open-source alternative to Mailchimp with list management, segmentation, campaign creation, and detailed analytics. It supports automation workflows, A/B testing, and integrates with external SMTP services for delivery.

Key strengths:

• Full Mailchimp-like feature set (automation, segmentation, A/B testing)
• Subscriber list management with custom fields
• Campaign scheduling and drip sequences
• Detailed analytics (opens, clicks, geolocation, device tracking)
• GDI and Mailgun integration for delivery

When to use: Teams migrating from Mailchimp who need feature parity with a self-hosted solution.

Docker Compose Deployment

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version: '3.8'
services:
  mailtrain-mysql:
    image: mariadb:11
    container_name: mailtrain-mysql
    environment:
      MYSQL_ROOT_PASSWORD: mailtrain-root-password
      MYSQL_DATABASE: mailtrain
      MYSQL_USER: mailtrain
      MYSQL_PASSWORD: mailtrain-password
    volumes:
      - mailtrain-mysql-data:/var/lib/mysql
    networks:
      - mailtrain-network

  mailtrain-redis:
    image: redis:7-alpine
    container_name: mailtrain-redis
    networks:
      - mailtrain-network

  mailtrain:
    image: mailtrain/mailtrain:latest
    container_name: mailtrain
    depends_on:
      - mailtrain-mysql
      - mailtrain-redis
    ports:
      - "3000:3000"
    environment:
      DB_HOST: mailtrain-mysql
      DB_NAME: mailtrain
      DB_USER: mailtrain
      DB_PASSWORD: mailtrain-password
      REDIS_HOST: mailtrain-redis
      REDIS_PORT: 6379
    volumes:
      - mailtrain-data:/app/server/files
    networks:
      - mailtrain-network
    restart: unless-stopped

volumes:
  mailtrain-mysql-data:
  mailtrain-data:

networks:
  mailtrain-network:
    driver: bridge

Tracking & Analytics Deep Dive

All three platforms provide email engagement tracking, but with different levels of detail:

Postal tracks every message lifecycle event: queued, sent, delivered, bounced, opened, clicked, complained. Each event generates a webhook notification, enabling real-time integration with your application.

Listmonk provides aggregate analytics in its dashboard: campaign open rates, click-through rates, bounce rates, and subscriber growth over time. Individual subscriber tracking shows engagement history per contact.

Mailtrain offers the most Mailchimp-like analytics: geographic heat maps of opens, device/browser breakdowns, A/B test comparisons, and automation workflow performance metrics.

Why Self-Host Email Delivery?

Third-party email services charge per message sent and per subscriber stored. At 100K+ subscribers or millions of messages per month, costs become significant. Self-hosting eliminates per-message pricing, gives you unlimited subscribers, and keeps subscriber data under your control — critical for GDPR and privacy compliance.

For organizations also managing email alias infrastructure, combining a delivery platform with alias management creates a complete self-hosted email stack. And if you need email testing infrastructure before sending campaigns, integrate a sandbox SMTP server into your deployment pipeline.

FAQ

Can Postal replace SendGrid or Mailgun entirely?

Yes. Postal provides the same core functionality: SMTP API, HTTP API, webhooks, tracking, and bounce handling. You’ll need to manage your own sending IPs and configure SPF/DKIM/DMARC records, but the feature parity is close. Many organizations run Postal alongside a cloud provider for redundancy.

How does Listmonk handle bounce management?

Listmonk processes bounces via webhook callbacks from your SMTP relay (Postal, Amazon SES, etc.). When a bounce is reported, Listmonk marks the subscriber as hard-bounced (permanently disabled) or soft-bounced (temporary, retried). You can configure bounce thresholds and automatic suppression.

What is the difference between Postal and Listmonk?

Postal is a mail delivery server (like SendGrid) — it accepts and delivers email with full tracking. Listmonk is a campaign manager (like Mailchimp) — it manages subscriber lists and campaigns but requires an external SMTP server for actual delivery. You can use Listmonk with Postal as the delivery backend.

Can I migrate from Mailchimp to Mailtrain?

Yes. Mailtrain can import Mailchimp subscriber lists via CSV export. Campaign templates may need adjustment since Mailtrain uses Handlebars templating while Mailchimp uses its own syntax. Automation workflows need to be rebuilt manually.

How do I set up open and click tracking?

All three platforms enable tracking by default. Open tracking works via a 1x1 tracking pixel embedded in HTML emails. Click tracking rewrites all links in the email to point through the platform’s tracking server, which logs the click before redirecting to the original URL. Ensure your DNS is configured so tracking domains resolve correctly.

What SMTP settings does Listmonk need?

Listmonk doesn’t send email directly — it connects to an external SMTP server. Configure it with your Postal, Amazon SES, or any SMTP relay’s host, port, username, and password. Listmonk will manage the campaign queue and feed messages to the SMTP server with rate limiting and concurrency controls.