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Automate email categorization & response generation with Gmail & GPT-4

PaulPaul
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2/3/2026
GitHubData ExtractionHTTP RequestRepositoryAPI
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Gmail AI Email Manager - Setup Guide

🎯 Workflow Overview

This workflow will create an intelligent Gmail email manager that can:

  • Monitor incoming emails via webhook
  • Analyze email content using AI
  • Categorize emails automatically
  • Generate smart responses
  • Take actions based on email content
  • Send notifications for important emails

📋 Pre-Setup Checklist

Before we build the workflow, let me gather the necessary information and validate our approach.

Phase 1: Discovery & Planning

  • [ ] Search for Gmail nodes
  • [ ] Find AI analysis nodes
  • [ ] Identify webhook trigger options
  • [ ] Check notification nodes

Phase 2: Configuration Requirements

  • [ ] Gmail API credentials
  • [ ] AI service (OpenAI/Claude) API key
  • [ ] Webhook URL setup
  • [ ] Email classification rules

🔧 Setup Instructions

Step 1: Gmail API Setup

  1. Go to Google Cloud Console
  2. Create new project or select existing
  3. Enable Gmail API
  4. Create OAuth 2.0 credentials
  5. Add authorized redirect URI: https://your-n8n-instance.com/rest/oauth2-credential/callback

Step 2: AI Service Setup

Choose one of the following:

  • OpenAI: Get API key from platform.openai.com
  • Claude: Get API key from console.anthropic.com
  • Local AI: Set up Ollama or similar

Step 3: n8n Credentials

  1. Gmail OAuth2: Add client ID, secret, and scopes
  2. AI Service: Add API key
  3. Webhook: Configure webhook URL

Gmail AI Email Manager - Setup Guide

🔧 Quick Setup Checklist

1. Google Cloud Console

  • [ ] Enable Gmail API
  • [ ] Create OAuth2 credentials
  • [ ] Add redirect URI: https://your-n8n.com/rest/oauth2-credential/callback
  • [ ] Set up Gmail push notifications with Pub/Sub

2. API Keys

  • [ ] Get OpenAI API key from platform.openai.com
  • [ ] Create Google Sheets for logging (optional)

3. n8n Credentials

  • [ ] Gmail OAuth2: Client ID, Secret, Scopes: gmail.readonly,gmail.modify,gmail.compose
  • [ ] OpenAI API: Your API key

4. Gmail Labels (Create these)

  • [ ] URGENT (red)
  • [ ] IMPORTANT (orange)
  • [ ] PROMOTIONAL (purple)
  • [ ] PERSONAL (green)
  • [ ] WORK (blue)
  • [ ] SPAM (gray)

5. Update Workflow Values

  • [ ] High Priority Alert: Change notification email
  • [ ] Spreadsheet Log: Update sheet ID (if using)
  • [ ] Webhook: Copy URL after saving workflow

6. Test

  • [ ] Save & activate workflow
  • [ ] Send test email to Gmail
  • [ ] Check execution log
  • [ ] Verify auto-categorization works

That's it! Your AI email manager is ready! 🚀

Automate Email Categorization and Response Generation with Gmail and GPT-4

This n8n workflow streamlines your email management by automatically categorizing incoming emails and generating intelligent, context-aware responses using Google's Gmail service and OpenAI's GPT-4.

What it does

This workflow is designed to be triggered manually (e.g., via a webhook call) and performs the following key steps:

  1. Receives a Trigger: The workflow starts by receiving a trigger, likely from an external system or a manual execution.
  2. Generates AI Response: It then utilizes the OpenAI node to generate content. This is likely used to categorize an email or draft a response based on provided input.
  3. Conditional Logic: An "If" node introduces conditional logic, allowing the workflow to branch based on the outcome of a previous step (e.g., the AI's categorization or a specific keyword in the email).
  4. Google Sheets Interaction: The Google Sheets node suggests that the workflow might read from or write data to a Google Sheet, potentially for logging categorized emails, storing response templates, or managing a list of email addresses.
  5. Gmail Action: The Gmail node indicates that the workflow will perform an action within Gmail, such as sending an email, marking an email as read, or applying a label.
  6. Responds to Webhook: Finally, the workflow sends a response back to the initial webhook trigger, indicating completion or providing results.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Instance: A running instance of n8n.
  • OpenAI API Key: An API key for OpenAI (likely for GPT-4 access).
  • Google Account: A Google account with access to Gmail and Google Sheets.
  • Google Sheets Credential: An n8n credential configured for Google Sheets.
  • Gmail Credential: An n8n credential configured for Gmail.

Setup/Usage

  1. Import the Workflow: Import the provided JSON into your n8n instance.
  2. Configure Credentials:
    • Set up your OpenAI API Key credential in the OpenAI node.
    • Configure your Google Sheets credential in the Google Sheets node.
    • Configure your Gmail credential in the Gmail node.
  3. Customize Nodes:
    • Webhook: The Webhook node is the trigger. You will need to configure how it receives data (e.g., HTTP POST request) and what data it expects.
    • OpenAI: Adjust the prompt in the OpenAI node to suit your categorization or response generation needs. Specify the model (e.g., gpt-4) and any other parameters.
    • If: Customize the conditions in the "If" node to match your desired logic for email categorization or response routing.
    • Google Sheets: Configure the Google Sheets node with the correct spreadsheet ID, sheet name, and operation (e.g., append row, read data).
    • Gmail: Configure the Gmail node for the desired action, such as send email, modify message, or add label, including recipient, subject, and body (potentially using output from the OpenAI node).
    • Respond to Webhook: Configure the response content for the Webhook node.
  4. Activate the Workflow: Once configured, activate the workflow. You can then trigger it by sending a request to the Webhook URL.

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