Automate Gmail responses with GPT and human-in-the-loop verification

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Important notice

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

1. Workflow Overview

Try It Out! This n8n template uses AI to automatically respond to your Gmail inbox by drafting response for your approval via email. How it works Gmail Trigger monitors your inbox for new emails AI...

Best for

Ticket Management automation workflows
Multimodal AI automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.gmailtrigger, n8n-nodes-base.code, n8n-nodes-base.gmail, @n8n/n8n-nodes-langchain.lmchatopenai, n8n-nodes-base.stickynote, n8n-nodes-base.if, @n8n/n8n-nodes-langchain.informationextractor, n8n-nodes-base.set

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Nick Canfield.

Original n8n.io source

1.1 Workflow description

Title: Automate Gmail responses with GPT and human-in-the-loop verification
Workflow name: Automate Gmail responses with GPT and human-in-the-loop verification

Try It Out!

This n8n template uses AI to automatically respond to your Gmail inbox by drafting response for your approval via email.

How it works

Gmail Trigger monitors your inbox for new emails
AI Analysis determines if a response is needed based on your criteria
Draft Generation creates contextually appropriate replies using your business information
Human Approval sends you the draft for review before sending
Auto-Send replies automatically once approved

Setup

Connect your Gmail account to the Gmail Trigger node
Update the "Your Information" node with:
- Entity name and description
- Approval email address
- Resource guide (FAQs, policies, key info)
- Response guidelines (tone, style, formatting preferences)
Configure your LLM provider (OpenAI, Claude, Gemini, etc.) with API credentials
Test with a sample email

Requirements

n8n instance (self-hosted or cloud)
Gmail account with API access
LLM provider API key

Need Help?

Email Nick @ [email protected]

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 - Gmail Trigger

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

Block 2 - Clean Up Email Code

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 3 - Send Reply

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

Block 4 - Ask User for Approval

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

Block 5 - OpenAI Chat Model

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

Block 6 - Sticky Note

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

Block 7 - Sticky Note1

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

Block 8 - Sticky Note3

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

Block 9 - Sticky Note4

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

Block 10 - If Email Needs Response

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

Block 11 - Sticky Note6

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

Block 12 - Sticky Note7

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

Block 13 - Sticky Note8

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

Block 14 - Drafts Email Response (HTML)

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

Block 15 - Sticky Note9

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

Block 16 - Approved?

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

Block 17 - Sticky Note2

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

Block 18 - Your Information

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

Block 19 - Sticky Note10

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

Block 20 - Determines if Email Needs Response

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

3. Summary Table

Workflow	Automate Gmail responses with GPT and human-in-the-loop verification
Complexity	advanced
Nodes	20
Categories	Ticket Management, Multimodal AI
Author	Nick Canfield
Published	30 Oct 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/10344/10344.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 Ticket Management workflows Multimodal AI workflows

Frequently asked questions

What does Automate Gmail responses with GPT and human-in-the-loop verification 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 Ticket Management, Multimodal AI use case.

Nick Canfield

1 workflow

Nodes

n8n-nodes-base.gmailtrigger n8n-nodes-base.code n8n-nodes-base.gmail @n8n/n8n-nodes-langchain.lmchatopenai n8n-nodes-base.stickynote n8n-nodes-base.if @n8n/n8n-nodes-langchain.informationextractor n8n-nodes-base.set

Complexity

advanced

Published 30 Oct 2025

Likes 0

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Install path: /data/workflows/10344/10344.json

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Automate Gmail responses with GPT and human-in-the-loop verification

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Try It Out!

How it works

Setup

Requirements

Need Help?

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Gmail Trigger

Block 2 - Clean Up Email Code

Block 3 - Send Reply

Block 4 - Ask User for Approval

Block 5 - OpenAI Chat Model

Block 6 - Sticky Note

Block 7 - Sticky Note1

Block 8 - Sticky Note3

Block 9 - Sticky Note4

Block 10 - If Email Needs Response

Block 11 - Sticky Note6

Block 12 - Sticky Note7

Block 13 - Sticky Note8

Block 14 - Drafts Email Response (HTML)

Block 15 - Sticky Note9

Block 16 - Approved?

Block 17 - Sticky Note2

Block 18 - Your Information

Block 19 - Sticky Note10

Block 20 - Determines if Email Needs Response

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