Gmail email categorization & auto reply with GPT-4o 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

Description This section automates Gmail message handling through AI powered classification and response. Using the LangChain Text Classifier, incoming emails are analyzed and sorted into four c...

Best for

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

Tools used

n8n-nodes-base.gmailtrigger, @n8n/n8n-nodes-langchain.textclassifier, @n8n/n8n-nodes-langchain.lmchatopenai, n8n-nodes-base.gmail, @n8n/n8n-nodes-langchain.openai, n8n-nodes-base.googlesheets, 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 Haruki Kuwai.

Original n8n.io source

1.1 Workflow description

Title: Gmail email categorization & auto reply with GPT-4o and Google Sheets
Workflow name: Gmail email categorization & auto reply with GPT-4o and Google Sheets

🧭 Description

This section automates Gmail message handling through AI-powered classification and response. Using the LangChain Text Classifier, incoming emails are analyzed and sorted into four categories — High Priority, Advertisement, Inquiry, and Finance/Billing — each triggering a dedicated action flow.

High Priority: AI generates a professional draft reply and saves it to Gmail.

Advertisement: AI summarizes content and logs it to Google Sheets.

Inquiry: AI composes a customer-friendly response automatically.

Finance/Billing: AI creates a brief summary and forwards it to the accounting email.

This system reduces manual sorting, ensures consistent communication quality, and speeds up email management with full automation.

💡 Use Cases

Automatically categorize incoming Gmail messages by topic or intent.

Generate AI-written reply drafts for urgent business messages.

Summarize marketing or promotional emails into Google Sheets for tracking.

Provide automated responses to customer inquiries.

Forward billing or invoice messages directly to accounting teams.

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 1.2

Block 2 - Text Classifier

Type / Role: @n8n/n8n-nodes-langchain.textClassifier - textClassifier
Config choices: Version 1.1

Block 3 - OpenAI Chat Model

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

Block 4 - Save Priority Mail

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

Block 5 - Save Advertisement Mail

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

Block 6 - Save Inquiry Mail

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

Block 7 - Save Finance Mail

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

Block 8 - Generate Priority Draft

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.8

Block 9 - Generate Ad Summary

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.8

Block 10 - Generate Finance Summary

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.8

Block 11 - Generate Inquiry Reply

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.8

Block 12 - Create Draft

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

Block 13 - Append Row to Sheet

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.6

Block 14 - Send Finance Mail

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

Block 15 - Reply to Inquiry

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

Block 16 - Sticky Note

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

Block 17 - Sticky Note1

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

Block 18 - Sticky Note2

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

3. Summary Table

Workflow	Gmail email categorization & auto reply with GPT-4o and Google Sheets
Complexity	advanced
Nodes	18
Categories	Ticket Management, AI Summarization
Author	Haruki Kuwai
Published	24 Oct 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/10118/10118.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 Gmail email categorization & auto reply with GPT-4o and Google Sheets do?

Description This section automates Gmail message handling through AI powered classification and response. Using the LangChain Text Classifier, incoming emails are analyzed and sorted into four c...

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.

Haruki Kuwai

3 workflows

Nodes

n8n-nodes-base.gmailtrigger @n8n/n8n-nodes-langchain.textclassifier @n8n/n8n-nodes-langchain.lmchatopenai n8n-nodes-base.gmail @n8n/n8n-nodes-langchain.openai n8n-nodes-base.googlesheets n8n-nodes-base.stickynote

Complexity

advanced

Published 24 Oct 2025

Likes 0

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Install path: /data/workflows/10118/10118.json

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Gmail email categorization & auto reply with GPT-4o and Google Sheets

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

🧭 Description

💡 Use Cases

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Gmail Trigger

Block 2 - Text Classifier

Block 3 - OpenAI Chat Model

Block 4 - Save Priority Mail

Block 5 - Save Advertisement Mail

Block 6 - Save Inquiry Mail

Block 7 - Save Finance Mail

Block 8 - Generate Priority Draft

Block 9 - Generate Ad Summary

Block 10 - Generate Finance Summary

Block 11 - Generate Inquiry Reply

Block 12 - Create Draft

Block 13 - Append Row to Sheet

Block 14 - Send Finance Mail

Block 15 - Reply to Inquiry

Block 16 - Sticky Note

Block 17 - Sticky Note1

Block 18 - Sticky Note2

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