Listmonk: High-Performance Open-Source Newsletter and Mailing List Manager

What Is Listmonk?

Listmonk is a high-performance newsletter and mailing list manager. Written in Go, backed by PostgreSQL — it handles millions of subscribers on a single server. 16K+ GitHub stars.

Listmonk vs Mailchimp vs Kit.com

Architecture

┌───────────────────────────────────┐
│         Listmonk (Go)            │
│                                   │
│  ┌───────────┐  ┌─────────────┐  │
│  │  Web UI   │  │  REST API   │  │
│  └─────┬─────┘  └──────┬──────┘  │
│        │                │         │
│  ┌─────▼────────────────▼──────┐  │
│  │        Core Engine          │  │
│  │  • Campaign Manager         │  │
│  │  • Template Renderer        │  │
│  │  • Subscriber Manager       │  │
│  │  • Queue + Rate Limiter     │  │
│  └─────────────┬──────────────┘  │
│                │                  │
│  ┌─────────────▼──────────────┐  │
│  │       PostgreSQL           │  │
│  └─────────────────────────────┘  │
│                                   │
│  SMTP: SES, Mailgun, Postmark    │
└───────────────────────────────────┘

Docker Deployment

version: "3.9"
services:
  listmonk:
    image: listmonk/listmonk:latest
    ports:
      - "9000:9000"
    environment:
      - TZ=Europe/Amsterdam
    volumes:
      - ./config.toml:/listmonk/config.toml
    depends_on:
      - db

  db:
    image: postgres:16-alpine
    environment:
      - POSTGRES_USER=listmonk
      - POSTGRES_PASSWORD=listmonk
      - POSTGRES_DB=listmonk
    volumes:
      - pgdata:/var/lib/postgresql/data

volumes:
  pgdata:

config.toml

[app]
address = "0.0.0.0:9000"
admin_username = "admin"
admin_password = "your-secure-password"

[db]
host = "db"
port = 5432
user = "listmonk"
password = "listmonk"
database = "listmonk"

# Amazon SES
[smtp.ses]
enabled = true
host = "email-smtp.eu-west-1.amazonaws.com"
port = 587
auth_protocol = "login"
username = "YOUR_SES_KEY"
password = "YOUR_SES_SECRET"
max_conns = 10
max_msg_retries = 3
idle_timeout = "15s"

Performance

Listmonk is written in Go — it’s incredibly efficient:

Compare: Mailchimp charges $350/month for 100K subscribers. Listmonk handles it on a $10/month VPS.

SMTP Provider Costs

Total cost for 100K subscribers: Listmonk ($0) + Hetzner VPS ($8) + SES ($10) = $18/month vs Mailchimp’s $350/month.

Key Features

SQL-Powered Segmentation

-- Target subscribers who opened last campaign but didn't click
SELECT * FROM subscribers
WHERE id IN (
  SELECT subscriber_id FROM campaign_views
  WHERE campaign_id = 42
)
AND id NOT IN (
  SELECT subscriber_id FROM link_clicks
  WHERE campaign_id = 42
);

Template System

{{ template "header" . }}

<h1>Hello {{ .Subscriber.FirstName }}!</h1>

{{ if eq .Subscriber.Attribs.plan "pro" }}
  <p>As a Pro member, here's your exclusive content...</p>
{{ else }}
  <p>Upgrade to Pro for exclusive access.</p>
{{ end }}

{{ template "footer" . }}

REST API

# Add subscriber
curl -u admin:password http://listmonk:9000/api/subscribers \
  -d '{"email":"new@user.com","name":"New User","lists":[1]}'

# Send transactional email
curl -u admin:password http://listmonk:9000/api/tx \
  -d '{"subscriber_email":"user@domain.com","template_id":1,"data":{"order_id":"12345"}}'

When to Use Listmonk

• ✅ Budget-conscious (under $20/mo for any scale)
• ✅ Data ownership requirements (GDPR, regulated industry)
• ✅ Developer-friendly (API-first, SQL segmentation)
• ✅ High volume (millions of subscribers)
• ❌ Non-technical team (no landing page builder)
• ❌ Need complex automation sequences (use n8n + Listmonk)

Related Articles

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