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Gmail AI Auto-Responder: Create Draft Replies to incoming emails

Nicolas ChourroutNicolas Chourrout
70484 views
2/3/2026
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This workflow automatically generates draft replies in Gmail. It's designed for anyone who manages a high volume of emails or often face writer's block when crafting responses. Since it doesn't send the generated message directly, you're still in charge of editing and approving emails before they go out.

How It Works:

  • Email Trigger: activates when new emails reach the Gmail inbox
  • Assessment: uses OpenAI gpt-4o and a JSON parser to determine if a response is necessary.
  • Reply Generation: crafts a reply with OpenAI GPT-4 Turbo
  • Draft Integration: after converting the text to html, it places the draft into the Gmail thread as a reply to the first message

Set Up Overview (~10 minutes):

  • OAuth Configuration (follow n8n instructions here):
    • Setup Google OAuth in Google Cloud console. Make sure to add Gmail API with the modify scope.
    • Add Google OAuth credentials in n8n. Make sure to add the n8n redirect URI to the Google Cloud Console consent screen settings.
  • OpenAI Configuration: add OpenAI API Key in the credentials
  • Tweaking the prompt: edit the system prompt in the "Generate email reply" node to suit your needs

Detailed Walkthrough

Check out this blog post where I go into more details on how I built this workflow.

Reach out to me here if you need help building automations for your business.

n8n Gmail AI Auto-Responder: Create Draft Replies to Incoming Emails

This n8n workflow automates the process of generating draft replies to incoming Gmail emails using AI, and then allows for human review before sending. It leverages the power of LangChain and OpenAI to understand email content and propose intelligent responses, significantly streamlining email management.

What it does

This workflow simplifies and automates the initial drafting of email replies, acting as an AI assistant for your inbox.

  1. Monitors Incoming Emails: Listens for new emails in your Gmail inbox.
  2. Filters Emails for Processing: Checks if the incoming email has a subject and body, ensuring only relevant emails are processed by the AI.
  3. Generates AI-Powered Draft Reply: Uses an OpenAI Chat Model (via LangChain) to analyze the email content and generate a suitable reply.
  4. Structures AI Output: Parses the AI's response into a structured format (likely JSON) for easy use.
  5. Creates Gmail Draft: Creates a new draft reply in Gmail with the AI-generated content, ready for your review and sending.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Account: A running instance of n8n.
  • Gmail Account: Connected to n8n with appropriate permissions to read emails and create drafts.
  • OpenAI API Key: For the OpenAI Chat Model to generate AI responses. This will be configured within the "OpenAI Chat Model" node.

Setup/Usage

  1. Import the Workflow: Download the provided JSON and import it into your n8n instance.
  2. Configure Credentials:
    • Gmail Trigger: Configure your Gmail OAuth2 credential to allow n8n to monitor your inbox.
    • OpenAI Chat Model: Configure your OpenAI API Key credential.
    • Gmail (Create Draft): Configure your Gmail OAuth2 credential to allow n8n to create drafts.
  3. Activate the Workflow: Once all credentials are set up, activate the workflow.

The workflow will now automatically monitor your Gmail inbox, generate AI-powered draft replies for new emails (that meet the subject/body criteria), and save them as drafts in your Gmail account for your review.

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