AutomationMart
Home/Browse/Automate email responses with GPT-4o-mini and human review in Gmail
n8n

Automate email responses with GPT-4o-mini and human review in Gmail

n8nn8n10 modulesv1.0
chainLlmgmailgmailTriggeriflmChatOpenAinoOpoutputParserStructuredtextClassifier

This n8n template demonstrates a “Human-in-the-Loop” workflow where AI automatically drafts replies to inbound emails, which are then reviewed and approved by a human before being sent. This powerful pattern ensures both the efficiency of AI and the quality assurance of human oversight. Use cases are many: Streamline sales inquiry responses, manage first-level customer support, handle initial recruitment communications, or any business process that requires personalized yet consistent email repl

At a glance

Automate email responses with GPT-4o-mini and human review in Gmail is a ready-made n8n workflow you import as a workflow JSON file — no build required. It connects chainLlm, gmail, gmailTrigger, if. It's free to download. Follow the 5-step import below to go live in minutes.

Platform
n8n
Connects
chainLlm, gmail, gmailTrigger, if, lmChatOpenAi, noOp
Modules
10
Price
Free
Version
v1.0
Automate email responses with GPT-4o-mini and human review in Gmail workflow diagram

About this workflow

This n8n template demonstrates a “Human-in-the-Loop” workflow where AI automatically drafts replies to inbound emails, which are then reviewed and approved by a human before being sent. This powerful pattern ensures both the efficiency of AI and the quality assurance of human oversight. Use cases are many: Streamline sales inquiry responses, manage first-level customer support, handle initial recruitment communications, or any business process that requires personalized yet consistent email replies. Good to know - At the time of writing, the cost per execution depends on your OpenAI API usage. This workflow uses a cost-effective model like gpt-4o-mini. See OpenAI Pricing for updated info. - The AI’s knowledge base and persona are fully customizable within the Basic LLM Chain node’s prompt. How it works 1. The Gmail Trigger node starts the workflow whenever a new email arrives in the specified inbox. 2. The Classify Potential Leads node uses AI to determine if the incoming email is a potential lead. If not, the workflow stops. 3. The Basic LLM Chain, powered by an OpenAI Chat Model, generates a draft reply based on a detailed system prompt and your internal knowledge base. 4. A Structured Output Parser is crucially used to force the AI’s output into a reliable JSON format ({"subject": "...", "body": "..."}), preventing errors in subsequent steps. 5. The Send for Review Gmail node sends the AI-generated draft to a human reviewer and pauses the workflow, waiting for a reply. 6. The IF node checks the reviewer’s reply for approval keywords (e.g., “approve”, “承認”). 7. If approved, the ✅ Send to Customer Gmail node sends the final email to the original customer. 8. If not approved, the reviewer’s feedback is treated as a revision request, and the workflow loops back to the Basic LLM Chain to generate a new draft incorporating the feedback. How to use - Gmail Trigger node: Configure with your own Gmail account credentials. - Send for Review node: Replace the placeholder email reviewer@example.com with the actual reviewer's email address. - IF node: You can customize the approval keywords to match your team’s vocabulary. - OpenAI Nodes: Ensure your OpenAI credentials are set up. You can select a different model if needed, but the prompt is optimized for models like GPT-4o mini. Requirements - An OpenAI account for the LLM. - A Gmail account for receiving customer emails and for the review process. Customising this workflow - By modifying the prompt and knowledge base in the Basic LLM Chain, you can adapt this agent for various departments, such as technical support, HR, or public relations. - The approval channel is not limited to Gmail. You can easily replace the review nodes with Slack or Microsoft Teams nodes to fit your internal communication tools.

n8n

How to import this n8n workflow

  1. 1

    Download the workflow JSON file after purchase.

  2. 2

    Open n8n → click the menu → Import from File.

  3. 3

    Select the downloaded JSON and import.

  4. 4

    Set up credentials for each node that requires them.

  5. 5

    Click Execute Workflow to test, then activate.

Setup guide

Setup guide included

Purchase to unlock the full step-by-step guide

Related N8n workflows

Automate Stripe Invoicing Workflow with ClickUp & Gmail Notifications

Stripe invoicing automation that is connected to your CRM, in this example, it is ClickUp. At the end of the flow, once your lead has been sent an invoice, you (or your team) will be sent an email notifying you of the newly sent invoice with all relevant details. How it works: • Monitors ClickUp task status → triggers workflow when status changes to send invoice. • Fetches task details from ClickUp, including customer name, email, and project cost. • Creates a Stripe customer using the fetched

Free

Automate employee onboarding with Slack, Jira, and Google Workspace integration

Who is this for? This template is ideal for HR teams, startup founders, operations leads, remote-first companies, and freelancers managing onboarding manually or across multiple tools. Whether you’re hiring your first intern or streamlining onboarding for dozens of new team members, this workflow automates the entire trigger → task creation → onboarding delivery process using no-code tools connected via n8n. --- What problem does this solve? Employee onboarding is often fragmented and error-pron

Free

Learn anything, write a book, design a curriculum

Hey n8n Innovators & Knowledge Seekers! 👋 Ever felt that spark? That "aha!" moment when you realize you need to dive deep into a new subject? Or maybe you've got a brilliant idea for a course, a comprehensive guide, or even the seeds of your next groundbreaking book, but the thought of structuring it all makes your brain do a backflip? What if you had an AI co-pilot, right within n8n, to help you LEARN ANYTHING profoundly, DESIGN A DETAILED CURRICULUM from scratch, or even OUTLINE YOUR NEXT BEST

Free

HR & IT helpdesk chatbot with audio transcription

An intelligent chatbot that assists employees by answering common HR or IT questions, supporting both text and audio messages. This unique feature ensures employees can conveniently ask questions via voice messages, which are transcribed and processed just like text queries. --- How It Works 1. Message Capture: When an employee sends a message to the chatbot in WhatsApp or Telegram (text or audio), the chatbot captures the input. 2. Audio Transcription: For audio messages,

Free

💰 Financial AI agent Telegram and WhatsApp

About this workflow Hi! I'm Bruno, and I'm here to help you automate your finances intelligently. This workflow has been carefully developed to transform the way you manage your money, using the power of artificial intelligence and the flexibility of n8n. With a focus on usability and innovation, this financial agent is the perfect solution for anyone seeking control and insights into their personal or business finances. This ready-to-use workflow acts as a powerful AI financial assistan

Free

Automated AWS IAM key compromise response with Slack & Claude AI

Automated AWS Key Compromise Remediation Description This n8n workflow provides a secure, enterprise-grade response system for AWS IAM access key compromises with built-in form submission and human approval mechanisms. When an AWS access key is suspected to be compromised, this workflow enables rapid containment through a secure web form interface with basic authentication, human approval via Slack, and automated damage prevention through immediate key deactivation, credential invalidation, and

Free

Centralize your forms and reply automatically with Tally + Airtable + Gmail

Still manually copy-pasting your Tally form responses? What if every submission went straight into Airtable — and the user got an automatic email right after? That’s exactly what this workflow does. No code, no headache — just a simple and fast automation: Tally → Airtable → Gmail. STEP 1 — Capture Tally Form Responses Goal Trigger the workflow automatically every time someone submits your Tally form. What we're setting up A webhook that catches form responses and kicks off the rest of the flow.

Free

Track Google search rankings with Bright Data, Google Sheets & Gmail

This workflow automates daily or manual keyword rank tracking on Google Search for your target domain. Results are logged in Google Sheets and sent via email using Bright Data's SERP API. Requirements: - n8n (local or cloud) with Google Sheets and Gmail nodes enabled - Bright Data API credentials --- Main Use Cases - Track Google search rankings for multiple keywords and domains automatically - Maintain historical rank logs in Google Sheets for SEO analysis - Receive scheduled or on-demand HT

Free

Reviews

No reviews yet

Be the first to buy and share your experience.

Leave a review

Sign in to share your experience with this workflow.

Log in to review
Free
No ratings yet

Create a free account to purchase workflows.

  • JSON blueprint — instant download
  • Setup guide PDF included
  • 5 downloads · valid 30 days
  • Works with n8n

Need help setting this up?

Book a 3-hour live setup session with an Agility consultant.

₹2,499/ session
3 hrs · video call
  • Configure live on Google Meet / Zoom
  • Free follow-up if workflow has defects
  • Platform expert assigned to you
Book installation session
Free