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Gmail email classifier with GPT-4 auto-generated draft replies

Supira Inc.Supira Inc.
740 views
2/3/2026
categorizationemaildatabaseaillm
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How It Works

This workflow automatically classifies incoming Gmail messages into categories such as High Priority, Inquiry, and Finance/Billing, and then generates professional draft replies using GPT-4. By combining Gmail integration with AI-powered text generation, the workflow helps business owners and freelancers reduce the time spent managing emails while ensuring that important messages are handled quickly and consistently.

When a new email arrives, the workflow:

  1. Triggers via Gmail.
  2. Uses an AI classifier to categorize the message.
  3. Applies the appropriate Gmail label.
  4. Passes the email body to GPT-4 to generate a tailored draft reply.
  5. Saves the draft in Gmail, ready for review and sending.

Requirements

  • A Gmail account with API access enabled.
  • An OpenAI API key with GPT-4 access.
  • n8n account or self-hosted instance.

Setup Instructions

  1. Import this workflow into your n8n instance.
  2. Under Credentials, connect your Gmail account and OpenAI API key.
  3. Replace placeholder YOUR_LABEL_ID_XXX values with your Gmail label IDs (obtainable via Gmail → List Labels).
  4. Execute the workflow and check that draft replies are generated in your Gmail account.

Customization

  • Add or edit categories to fit your business needs (e.g., “Sales Leads” or “Support”).
  • Adjust the GPT-4 prompts inside each “Generate Draft” node to match your preferred tone and style.
  • Combine with other workflows (e.g., CRM integration, Slack alerts) for a complete email automation system.

This template is especially useful for small businesses and freelancers who want to save time, improve response speed, and maintain professional communication without manually writing every reply.

Gmail Email Classifier with GPT-4 & Auto-Generated Draft Replies

This n8n workflow automates the process of classifying incoming Gmail emails using GPT-4 and then generating draft replies based on the classification. It streamlines email management by leveraging AI to understand email intent and propose suitable responses, saving time and improving response efficiency.

What it does

  1. Monitors Gmail: Continuously checks for new emails in your specified Gmail account.
  2. Classifies Email Content: Uses an AI Text Classifier (powered by OpenAI's GPT-4) to categorize the incoming email's content.
  3. Generates Draft Replies: Based on the email's classification, it uses an OpenAI Chat Model to generate a relevant draft reply.
  4. Creates Gmail Draft: Automatically creates a draft email in your Gmail account with the AI-generated reply, ready for your review and sending.

Prerequisites/Requirements

  • n8n Account: A running instance of n8n.
  • Gmail Account: A Google account with Gmail enabled, configured as a credential in n8n.
  • OpenAI API Key: An OpenAI API key with access to GPT-4 models, configured as a credential in n8n.

Setup/Usage

  1. Import the workflow:
    • Download the provided JSON file for this workflow.
    • In your n8n instance, go to "Workflows" and click "New".
    • Click the three dots menu (...) and select "Import from JSON".
    • Paste the workflow JSON or upload the file.
  2. Configure Credentials:
    • Gmail Trigger & Gmail Node: You will need to set up a Google OAuth2 credential for your Gmail account. Follow the n8n documentation for Google OAuth2 Single Service Account to create and configure this credential.
    • OpenAI Chat Model & Text Classifier: You will need to set up an OpenAI API Key credential. Follow the n8n documentation for OpenAI API Key to create and configure this credential.
  3. Activate the Workflow: Once credentials are set up, activate the workflow by toggling the "Active" switch in the top right corner of the workflow editor.

The workflow will now automatically process new emails as they arrive in your Gmail inbox, classify them, and create draft replies for your review.

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