Automatically label Gmail emails with GPT-5 classification

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Important notice

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

1. Workflow Overview

How it works This workflow automatically monitors your Gmail inbox and uses OpenAI's GPT model to intelligently classify incoming emails into four key categories: High Priority Urgent emails requir...

Best for

AI Summarization automation workflows
Multimodal AI automation workflows
intermediate 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-nodes-base.stickynote

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Automatically label Gmail emails with GPT-5 classification
Workflow name: Automatically label Gmail emails with GPT-5 classification

How it works

This workflow automatically monitors your Gmail inbox and uses OpenAI's GPT model to intelligently classify incoming emails into four key categories:

High Priority - Urgent emails requiring immediate attention from executives, clients, or stakeholders
Promotion - Marketing emails, sales offers, product launches, and event invitations
Finance/Billing - Invoices, receipts, payment notifications, and financial records
Customer Support - Help requests, troubleshooting queries, and service-related issues

Once classified, emails are automatically labeled in Gmail using the appropriate tags, making it easy to filter, search, and prioritize your communications.

How to set up

Requirements

Gmail account with OAuth2 access enabled
OpenAI API key with GPT model access
Custom Gmail labels created for each category

Step-by-step setup

Create Gmail Labels

In Gmail, create these labels: "High Priority", "Promotion", "Finance/Billing", "Customer Support"
Note the label IDs (you'll need to replace the hardcoded ones in the workflow)

Configure Credentials

Add your Gmail OAuth2 credentials in n8n
Add your OpenAI API credentials

Update Label IDs

Replace the hardcoded label IDs in each Gmail node with your actual label IDs
You can find label IDs by testing the Gmail node or using Gmail API

Adjust Classification Rules

Review the Text Classifier categories and modify descriptions to match your specific needs
Add or remove categories as required

Set Polling Frequency

The workflow is set to check every minute - adjust based on your email volume

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 - 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 - High Priority

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

Block 5 - Promotion

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

Block 6 - Finance/Billings

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

Block 7 - Customer Support

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

Block 8 - Sticky Note

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

3. Summary Table

Workflow	Automatically label Gmail emails with GPT-5 classification
Complexity	intermediate
Nodes	8
Categories	AI Summarization, Multimodal AI
Author	Abideen Bello
Published	23 Aug 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/7759/7759.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 AI Summarization workflows Multimodal AI workflows

Frequently asked questions

What does Automatically label Gmail emails with GPT-5 classification 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 AI Summarization, Multimodal AI use case.

Abideen Bello

3 workflows

Nodes

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

Complexity

intermediate

Published 23 Aug 2025

Likes 0

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Install path: /data/workflows/7759/7759.json

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Automatically label Gmail emails with GPT-5 classification

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

How it works

How to set up

Requirements

Step-by-step setup

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Gmail Trigger

Block 2 - Text Classifier

Block 3 - OpenAI Chat Model

Block 4 - High Priority

Block 5 - Promotion

Block 6 - Finance/Billings

Block 7 - Customer Support

Block 8 - Sticky Note

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