Node-RED: Receiving button pushes and sending emails

This documentation is part of the Use case: connect mailboxes guide. View the full guide here: Seamlessly connect hundreds of mailboxes in a post office.

Welcome to the Stackhero documentation

Stackhero provides a fully managed Node-RED cloud environment designed to get you building workflows quickly:

• Built-in MQTT server (Mosquitto) for seamless IoT integration.
• Full access to the Node-RED admin UI for managing flows and settings.
• Node-RED Dashboard included for real-time visualization.
• Dedicated SMTP email server included, with no limits on sending.
• Effortless one-click updates to keep your instance current.
• Custom domain names with automatic HTTPS: for example, https://node-red.your-company.com.
• High performance and strong security with private, dedicated infrastructure.

You can have a secure, production-ready Node-RED cloud hosting instance running in about 5 minutes. Stackhero handles setup, updates, and infrastructure so you can focus on building automations.

To manage the button actions and dispatch notifications to users, Node-RED was chosen for data processing, with a MongoDB database to store user emails.

Node-RED is a graphical programming tool developed by IBM, ideal for this kind of task. It is easy to use, powerful, and highly extensible.

Thanks to Node-RED, our customer was able to create their entire backend in just a few hours!

When a mailbox button is pressed, the message is received by Node-RED via MQTT. Node-RED then locates the corresponding user in the MongoDB database, composes a new email, and sends it.

Node-RED flow: only 5 nodes are required to create the entire backend!

When you start a Node-RED instance on Stackhero, you get an MQTT server along with a dedicated email server, enabling you to send unlimited emails!