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AI-powered lead email classification & auto-reply with GPT-4o and Gmail

RodrigoRodrigo
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2/3/2026
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How it works

This workflow automatically responds to incoming emails identified as potential leads using AI-generated text.
It connects to your email inbox via IMAP, classifies incoming messages with an AI model, filters out non-leads, and sends a personalized reply to relevant messages.

Steps

  1. Email Trigger (IMAP): Watches your inbox for new emails in real time.
  2. Is Lead? (Message Model): Uses AI to determine whether the sender is a lead.
  3. Filter: Passes only lead emails to the next step.
  4. Write Customized Reply (Message Model): Generates a personalized response using AI.
  5. Get Message: Retrieves original email details to ensure correct threading.
  6. Reply to Message: Sends the AI-generated reply to the sender.

Setup Instructions

  • Connect your IMAP Email credentials to the first node and set the folder to watch (e.g., INBOX).
  • In the "Filter leads" node, adjust the AI prompt to match your lead qualification criteria.
  • In the "Reply with customized message" node, edit the AI prompt to reflect your product, service, or business tone.
  • Connect your Gmail (or other email provider) credentials in the Get Message and Reply to Message nodes.
  • Test with a few sample emails before activating.

Requirements

  • IMAP-enabled email account (for receiving messages)
  • Gmail API access (or modify to your email provider)
  • OpenAI or other AI model credentials for message analysis and reply generation

This template is ready to use, with all steps documented inside sticky notes for easy customization.

AI-Powered Lead Email Classification & Auto-Reply with GPT-4o and Gmail

This n8n workflow automates the process of classifying incoming emails as sales leads and sending an appropriate auto-reply using OpenAI's GPT-4o, all integrated with your Gmail account. It helps businesses efficiently manage sales inquiries by automatically identifying potential leads and responding promptly.

What it does

This workflow performs the following key steps:

  1. Triggers on New Emails: Continuously monitors a specified IMAP email account for new incoming emails.
  2. Filters Emails: Checks if the email subject or body contains specific keywords (e.g., "lead", "sales", "inquiry") to identify potential sales leads.
  3. Classifies with OpenAI (GPT-4o): For emails that pass the initial filter, it sends the email content to OpenAI (GPT-4o) to classify if it's a sales lead and to generate a suitable auto-reply.
  4. Sends Auto-Reply via Gmail: If classified as a sales lead, it uses the generated auto-reply from OpenAI to send a personalized response via Gmail to the original sender.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Instance: A running instance of n8n.
  • IMAP Email Account: Access to an IMAP-enabled email account for the "Email Trigger (IMAP)" node. This is where the workflow will listen for new emails.
  • Gmail Account: A configured Gmail credential in n8n for sending auto-replies.
  • OpenAI API Key: An API key from OpenAI with access to GPT-4o (or another suitable model) for email classification and response generation.

Setup/Usage

  1. Import the Workflow:

    • Download the provided JSON file.
    • In your n8n instance, click on "Workflows" in the left sidebar.
    • Click "New" and then "Import from JSON".
    • Paste the JSON content or upload the file.

  2. Configure Credentials:

    • Email Trigger (IMAP): Click on the "Email Trigger (IMAP)" node (ID: 10). Configure your IMAP credentials (e.g., host, port, username, password).
    • Gmail: Click on the "Gmail" node (ID: 356). Configure your Google OAuth 2.0 credential for Gmail.
    • OpenAI: Click on the "OpenAI" node (ID: 1250). Configure your OpenAI API key credential. Ensure you select a model capable of text generation and classification, such as gpt-4o.

  3. Customize the Filter (Optional):

    • Click on the "Filter" node (ID: 844).
    • Adjust the conditions to refine which emails are considered potential leads before being sent to OpenAI. You might want to add more keywords, check specific email headers, or exclude certain senders.

  4. Customize OpenAI Prompt (Optional):

    • Click on the "OpenAI" node (ID: 1250).
    • Review and adjust the prompt used to instruct GPT-4o for email classification and auto-reply generation. You can make it more specific to your business needs, define what constitutes a "sales lead" for you, and refine the tone of the auto-reply.

  5. Activate the Workflow:

    • Once all credentials and configurations are set, click the "Activate" toggle in the top right corner of the n8n editor to start the workflow.

The workflow will now automatically monitor your IMAP inbox, classify potential sales leads using AI, and send automated, intelligent responses via Gmail.

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