Send AI-generated Gmail auto replies with GPT-4o-mini and Google Sheets

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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 automatically replies to important incoming Gmail messages using AI, while preventing duplicate or unnecessary replies. It applies multiple safety checks (filters, Google Sheets histo...

Best for

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

Tools used

n8n-nodes-base.set, n8n-nodes-base.gmailtrigger, n8n-nodes-base.if, n8n-nodes-base.code, n8n-nodes-base.googlesheets, n8n-nodes-base.gmail, @n8n/n8n-nodes-langchain.openai, 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 kota.

Original n8n.io source

1.1 Workflow description

Title: Send AI-generated Gmail auto replies with GPT-4o-mini and Google Sheets
Workflow name: Send AI-generated Gmail auto replies with GPT-4o-mini and Google Sheets

Overview

This workflow automatically replies to important incoming Gmail messages using AI, while preventing duplicate or unnecessary replies.

It applies multiple safety checks (filters, Google Sheets history, and Gmail sent history) to ensure replies are sent only when appropriate.

This template is designed for creators, freelancers, and teams who want a reliable and maintainable AI-powered email auto-reply system.

How it works

New Gmail messages are received and normalized into a consistent structure.
Unwanted emails (newsletters, promotions, no-reply senders) are filtered out.
The sender’s email is checked against a Google Sheets reply history.
Gmail is searched to confirm no recent reply was already sent.
If no duplicate is found, an AI-generated English reply is created and sent.

Setup steps

Connect your Gmail account.
Connect a Google Sheet for reply history tracking.
Review the ignore rules and thresholds in the config node.
Customize the AI prompt if needed.
Activate the workflow.

Estimated setup time: 5–10 minutes.

Notes

Sticky notes inside the workflow explain each processing step in detail.
No hardcoded API keys are used.
The workflow is intentionally linear for clarity and easy maintenance.

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 - Config - Rules & Thresholds

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

Block 2 - Gmail Trigger - New Emails

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

Block 3 - Normalize - Email Payload

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

Block 4 - IF - Ignore Filter

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.3

Block 5 - Code - Extract Sender Email

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

Block 6 - Get row(s) in sheet

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 7 - IF - Found in Reply History?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.3

Block 8 - Gmail - Search Sent to Sender

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

Block 9 - IF - Sent history exists?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.3

Block 10 - Reply to a message

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

Block 11 - Message a model

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 2.1

Block 12 - Sticky Note

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

Block 13 - Sticky Note1

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

Block 14 - Sticky Note2

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

Block 15 - Sticky Note3

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

Block 16 - Sticky Note4

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

Block 17 - Sticky Note5

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

3. Summary Table

Workflow	Send AI-generated Gmail auto replies with GPT-4o-mini and Google Sheets
Complexity	advanced
Nodes	17
Categories	Ticket Management, AI Summarization
Author	kota
Published	12 Jan 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/12652/12652.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 AI Summarization workflows

Frequently asked questions

What does Send AI-generated Gmail auto replies with GPT-4o-mini and Google Sheets 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, AI Summarization use case.

kota

3 workflows

Nodes

n8n-nodes-base.set n8n-nodes-base.gmailtrigger n8n-nodes-base.if n8n-nodes-base.code n8n-nodes-base.googlesheets n8n-nodes-base.gmail @n8n/n8n-nodes-langchain.openai n8n-nodes-base.stickynote

Complexity

advanced

Published 12 Jan 2026

Likes 0

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Install path: /data/workflows/12652/12652.json

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Send AI-generated Gmail auto replies with GPT-4o-mini and Google Sheets

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Overview

How it works

Setup steps

Notes

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Config - Rules & Thresholds

Block 2 - Gmail Trigger - New Emails

Block 3 - Normalize - Email Payload

Block 4 - IF - Ignore Filter

Block 5 - Code - Extract Sender Email

Block 6 - Get row(s) in sheet

Block 7 - IF - Found in Reply History?

Block 8 - Gmail - Search Sent to Sender

Block 9 - IF - Sent history exists?

Block 10 - Reply to a message

Block 11 - Message a model

Block 12 - Sticky Note

Block 13 - Sticky Note1

Block 14 - Sticky Note2

Block 15 - Sticky Note3

Block 16 - Sticky Note4

Block 17 - Sticky Note5

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