Gmail auto-reply generator with ChatGPT

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

This workflow contains community nodes that are only compatible with the self hosted version of n8n. Gmail Auto Reply with AI Automatically draft smart email replies using ChatGPT. Reclaim your tim...

Best for

Multimodal AI automation workflows
intermediate n8n builders looking for reusable templates

Tools used

n8n-nodes-base.gmailtrigger, n8n-nodes-base.gmail, n8n-nodes-base.set, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.lmchatopenai, @n8n/n8n-nodes-langchain.outputparserstructured, n8n-nodes-base.if, n8n-nodes-base.stickynote

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Matt Chong | n8n Creator.

Original n8n.io source

1.1 Workflow description

Title: Gmail auto-reply generator with ChatGPT
Workflow name: Gmail auto-reply generator with ChatGPT

This workflow contains community nodes that are only compatible with the self-hosted version of n8n.

Gmail Auto-Reply with AI

Automatically draft smart email replies using ChatGPT. Reclaim your time typing the same responses again and again.

Who is this for?

If you're overwhelmed with emails and constantly repeating yourself in replies, this workflow is for you.

Whether you're a freelancer, business owner, or team lead, it saves you time by handling email triage and drafting replies for you.

What does it solve?

This workflow reads your unread Gmail messages and uses AI to:

Decide whether the email needs a response
Automatically draft a short, polite reply when appropriate
Skip spam, newsletters, or irrelevant emails
Save the AI-generated reply as a Gmail draft (you can edit it before sending)

It takes email fatigue off your plate and keeps your inbox moving.

How it works

Trigger on New Email: Watches your Gmail inbox for unread messages.
AI Agent Review: Analyzes the content to decide if a reply is needed.
OpenAI ChatGPT: Drafts a short, polite reply (under 120 words).
Create Gmail Draft: Saves the response as a draft for you to review.
Label It: Applies a custom label like Action so you can easily find AI-handled emails.

How to set up?

Connect credentials:
- Gmail (OAuth2)
- OpenAI (API key)
Create the Gmail label:
- In your Gmail, create a label named Action (case-sensitive).

How to customize this workflow to your needs

Change the AI prompt: Add company tone, extra context, or different reply rules.
Label more intelligently: Add conditions or labels for “Newsletter,” “Meeting,” etc.
Adjust frequency: Change how often the Gmail Trigger polls your inbox.
Add manual review: Route drafts to a team member before sending.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Trigger on New Email

Type / Role: n8n-nodes-base.gmailTrigger - gmailTrigger
Config choices: Version 1.3

Block 2 - Get Unread Email

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.1

Block 3 - Get Required Fields

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 4 - AI Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 2.2

Block 5 - OpenAI

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 6 - Structured Output

Type / Role: @n8n/n8n-nodes-langchain.outputParserStructured - outputParserStructured
Config choices: Version 1.3

Block 7 - Can AI Agent Respond?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 8 - Create a draft

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.1

Block 9 - Label Email As "Action"

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.1

Block 10 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 11 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Gmail auto-reply generator with ChatGPT
Complexity	intermediate
Nodes	11
Categories	Multimodal AI
Author	Matt Chong \| n8n Creator
Published	17 Aug 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/7513/7513.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Multimodal AI workflows

Frequently asked questions

What does Gmail auto-reply generator with ChatGPT do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Multimodal AI use case.

Matt Chong | n8n Creator

10 workflows

Nodes

n8n-nodes-base.gmailtrigger n8n-nodes-base.gmail n8n-nodes-base.set @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.lmchatopenai @n8n/n8n-nodes-langchain.outputparserstructured n8n-nodes-base.if n8n-nodes-base.stickynote

Complexity

intermediate

Published 17 Aug 2025

Likes 0

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Install path: /data/workflows/7513/7513.json

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Gmail auto-reply generator with ChatGPT

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Gmail Auto-Reply with AI

Who is this for?

What does it solve?

How it works

How to set up?

How to customize this workflow to your needs

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Trigger on New Email

Block 2 - Get Unread Email

Block 3 - Get Required Fields

Block 4 - AI Agent

Block 5 - OpenAI

Block 6 - Structured Output

Block 7 - Can AI Agent Respond?

Block 8 - Create a draft

Block 9 - Label Email As "Action"

Block 10 - Sticky Note

Block 11 - Sticky Note1

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions