Postmark + n8n: No Code, No Limits

This is a submission for the Postmark Challenge: Inbox Innovators. TL;DR Receive postmark inbound webhooks with no effort The Challenge Experimenting with Postmark’s Inbound Email functionality often requires a tedious setup—writing HTTP request handling code, deploying it to a server, configuring DNS, managing firewalls, and more. Before you even start, the frustration kicks in. Wouldn’t it be great if there was just a single button to deploy everything effortlessly? That’s exactly what this project offers: a one-command solution to simplify Postmark webhooks testing. Demo & Setup To get started, ensure you have Docker installed. Project Structure Your setup includes the following essential files: ❯ tree -a -I .git . ├── docker-compose.yml # Core functionality ├── .env # Optional environment variables (credentials, server URL) ├── LICENSE └── n8n_node.json # Pre-configured n8n example 1 directory, 4 files Deployment Run the following commands to get started: git clone https://github.com/vk496/docker-postmark-n8n cd docker-postmark-n8n docker compose up -d docker compose logs lt Configuring Your Webhook Once deployed, confirm that your public endpoint is test-server (thanks to LocalTunnel): Your full webhook callback URL is now: https://test-server.loca.lt/webhook/postmark-inbound Update your Postmark Inbound Stream settings, test your webhook, and observe the results: Now, access your n8n instance via: Local http://localhost:5678 Public Tunnel https://test-server.loca.lt/ Default login credentials: Username: admin@example.com Password: Admin123 Track executions to confirm webhook activity: What’s Next? Now that you’ve received the callback, you can leverage it in countless ways! Forward data to an API endpoint Transcribe content using AI Translate with external services Scan for malicious attachments With n8n, automation possibilities are endless. Take inspiration from n8n workflows templates: ⚠️ Important: No Persistent Storage Ensure you export your workflow before restarting or removing the Docker container. This project is not intended for production operations Code Repository https://github.com/vk496/docker-postmark-n8n How I Built It Working with n8n inside Docker presented unique challenges, such as initializing default credentials and preloading workflows without direct environment variables. Creativity and workarounds were key to making this project possible. Feel free to explore and adapt ideas from the docker-compose.yml file!

May 28, 2025 - 19:40

This is a submission for the Postmark Challenge: Inbox Innovators.

TL;DR

Receive postmark inbound webhooks with no effort

The Challenge

Experimenting with Postmark’s Inbound Email functionality often requires a tedious setup—writing HTTP request handling code, deploying it to a server, configuring DNS, managing firewalls, and more. Before you even start, the frustration kicks in.

Wouldn’t it be great if there was just a single button to deploy everything effortlessly? That’s exactly what this project offers: a one-command solution to simplify Postmark webhooks testing.

Demo & Setup

To get started, ensure you have Docker installed.

Project Structure

Your setup includes the following essential files:

❯ tree -a -I .git
.
├── docker-compose.yml  # Core functionality
├── .env                # Optional environment variables (credentials, server URL)
├── LICENSE  
└── n8n_node.json       # Pre-configured n8n example


1 directory, 4 files

Deployment

Run the following commands to get started:

git clone https://github.com/vk496/docker-postmark-n8n
cd docker-postmark-n8n
docker compose up -d
docker compose logs lt

Configuring Your Webhook

Once deployed, confirm that your public endpoint is test-server (thanks to LocalTunnel):

Your full webhook callback URL is now:

https://test-server.loca.lt/webhook/postmark-inbound

Update your Postmark Inbound Stream settings, test your webhook, and observe the results:

Now, access your n8n instance via:

Local http://localhost:5678
Public Tunnel https://test-server.loca.lt/

Default login credentials:

Username: admin@example.com  
Password: Admin123

Track executions to confirm webhook activity:

What’s Next?

Now that you’ve received the callback, you can leverage it in countless ways!

Forward data to an API endpoint
Transcribe content using AI
Translate with external services
Scan for malicious attachments

With n8n, automation possibilities are endless. Take inspiration from n8n workflows templates:

⚠️ Important: No Persistent Storage

Ensure you export your workflow before restarting or removing the Docker container. This project is not intended for production operations

Code Repository

https://github.com/vk496/docker-postmark-n8n

How I Built It

Working with n8n inside Docker presented unique challenges, such as initializing default credentials and preloading workflows without direct environment variables. Creativity and workarounds were key to making this project possible.

Feel free to explore and adapt ideas from the docker-compose.yml file!