Auto-Respond to Gmail Enquiries using GPT-4o, Dumpling AI & LangChain Agent

n8n template #4057

Summary

Who is this for? This workflow is perfect for customer support teams, sales departments, or solopreneurs who receive frequent email enquiries and want to automate the initial response process using AI. If you spend too much time answering similar questions, this system helps respond faster and more intelligently—without writing a single line of code. What problem is this workflow solving? Manually responding to repeated customer enquiries slows productivity and increases delay. This workflow classifies if an incoming email is a real enquiry, analyzes the content with a LangChain-powered agent, fetches helpful context using Dumpling AI, and sends a personalized reply using Gmail—all within mi

How to set it up

Open template #4057 on n8n.io and click Use for free, or copy the template JSON and paste it onto an empty canvas in n8n.
Create 2 credentials under Credentials → Add credential: OpenAI Chat Model, OpenAI. Then open each of those nodes and pick the credential.
Check the model in the AI Agent node. The template may point at a model your account can't use; swap it for one you have access to.
Click Execute workflow and step through each node's output to confirm the data looks right.
Toggle the workflow to Active so its trigger runs on its own.

Hand off to your agent

Prompt

Help me set up the n8n workflow "Auto-Respond to Gmail Enquiries using GPT-4o, Dumpling AI & LangChain Agent" (https://n8n.io/workflows/4057). It uses: AI Agent, OpenAI Chat Model, Simple Memory, OpenAI, HTTP Request Tool. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.

Paste into Claude Code and it will do the rest.

Apps and nodes

AI Agent OpenAI Chat Model Simple Memory OpenAI HTTP Request Tool

Questions

Yes. Yang published it free on n8n.io as a verified creator, and it has 8,964 views. It runs on n8n Cloud or a self-hosted n8n instance.

OpenAI Chat Model, OpenAI. The other 3 nodes are built into n8n.

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