Automated Gmail classification and labeling with GPT-4, Sheets and Slack alerts

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Important notice

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

1. Workflow Overview

This n8n template automates email labeling using AI enhanced classification and intelligent routing Gmail users report spending significant time manually sorting email, so this tool helps alleviate...

Best for

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

Tools used

n8n-nodes-base.code, @n8n/n8n-nodes-langchain.lmchatopenai, @n8n/n8n-nodes-langchain.outputparserstructured, @n8n/n8n-nodes-langchain.agent, n8n-nodes-base.if, n8n-nodes-base.switch, n8n-nodes-base.gmail, n8n-nodes-base.googlesheets

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Automated Gmail classification and labeling with GPT-4, Sheets and Slack alerts
Workflow name: Automated Gmail classification and labeling with GPT-4, Sheets and Slack alerts

This n8n template automates email labeling using AI-enhanced classification and intelligent routing

Gmail users report spending significant time manually sorting email, so this tool helps alleviate that burden.

How it works

Gmail Trigger monitors unread emails every 2 minutes
Once an email arrives, the content is extracted with HTML cleaning
AI Agent (the node is set for Chat GPT-4) is used for classification & entity extraction
A Structured Output Parser parses the email to JSON
A 9-way category routing system categorizes the email (Inquiry, Support, Newsletter, Marketing, Personal, Urgent, Spam, Invoice, Meeting)
Gmail auto-labeling is used for each category
Google Sheets is used for logging (the main log that includes all emails and an error log which are emails that cannot be classified)
Slack alerts are generated for high-priority/urgent emails
Error handling is done with separate error logging in Google Sheets

How to use

Set up credentials for Google Gmail, LLM (ChatGPT, Gemini, etc.), Google Sheets, and Slack
Modify the categories as needed per user preference

Requirements

Gmail
Any LLM like ChatGPT or Google Gemini
Google Drive with Google Sheets is optional for logging and error handling
Slack is optional for high-priority messages

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 - Extract and Clean Email Content

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

Block 2 - OpenAI Chat Model

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

Block 3 - Structured Output Parser

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

Block 4 - Classify and Extract Entities

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3

Block 5 - Parse and Validate AI Response

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

Block 6 - Check Classification Success

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

Block 7 - Route by Category

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3.3

Block 8 - Label: Inquiry

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

Block 9 - Label: Support Request

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

Block 10 - Label: Newsletter

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

Block 11 - Label: Marketing

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

Block 12 - Label: Personal

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

Block 13 - Label: Urgent

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

Block 14 - Label: Spam

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

Block 15 - Label: Invoice/Receipt

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

Block 16 - Label: Meeting Request

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

Block 17 - Log All Emails

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

Block 18 - Check if High Priority or Urgent

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

Block 19 - Send Urgent Email Alert

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

Block 20 - Log Classification Errors

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

Block 21 - Email Ingestion

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

Block 22 - AI Classification

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

Block 23 - Routing Logic

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

Block 24 - Integrations

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

Showing the first 24 of 27 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Automated Gmail classification and labeling with GPT-4, Sheets and Slack alerts
Complexity	advanced
Nodes	27
Categories	Ticket Management, AI Summarization
Author	Chris Mielke
Published	15 Dec 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/11836/11836.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 Automated Gmail classification and labeling with GPT-4, Sheets and Slack alerts 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.

Chris Mielke

1 workflow

Nodes

n8n-nodes-base.code @n8n/n8n-nodes-langchain.lmchatopenai @n8n/n8n-nodes-langchain.outputparserstructured @n8n/n8n-nodes-langchain.agent n8n-nodes-base.if n8n-nodes-base.switch n8n-nodes-base.gmail n8n-nodes-base.googlesheets

Complexity

advanced

Published 15 Dec 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/11836/11836.json

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Automated Gmail classification and labeling with GPT-4, Sheets and Slack alerts

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

This n8n template automates email labeling using AI-enhanced classification and intelligent routing

How it works

How to use

Requirements

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Extract and Clean Email Content

Block 2 - OpenAI Chat Model

Block 3 - Structured Output Parser

Block 4 - Classify and Extract Entities

Block 5 - Parse and Validate AI Response

Block 6 - Check Classification Success

Block 7 - Route by Category

Block 8 - Label: Inquiry

Block 9 - Label: Support Request

Block 10 - Label: Newsletter

Block 11 - Label: Marketing

Block 12 - Label: Personal

Block 13 - Label: Urgent

Block 14 - Label: Spam

Block 15 - Label: Invoice/Receipt

Block 16 - Label: Meeting Request

Block 17 - Log All Emails

Block 18 - Check if High Priority or Urgent

Block 19 - Send Urgent Email Alert

Block 20 - Log Classification Errors

Block 21 - Email Ingestion

Block 22 - AI Classification

Block 23 - Routing Logic

Block 24 - Integrations

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