Supira Inc. This workflow corresponds to n8n.io template #8426 — we link there as the canonical source.
This workflow follows the Gmail → Gmail Trigger recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"id": "yleYtr2zaJKjyMOK",
"meta": {
"templateCredsSetupCompleted": true
},
"name": "Gmail Email Classifier with GPT-4 Auto-Generated Draft Replies",
"tags": [
{
"id": "eFlPj8ZRT4LrlBD1",
"name": "Automation",
"createdAt": "2025-09-09T16:15:06.029Z",
"updatedAt": "2025-09-09T16:15:06.029Z"
},
{
"id": "hjzY8e2beJ4ByFSh",
"name": "Email Automation",
"createdAt": "2025-09-09T16:15:20.964Z",
"updatedAt": "2025-09-09T16:15:20.964Z"
}
],
"nodes": [
{
"id": "d388e4be-fe23-4f1b-919b-e9d19338750a",
"name": "Gmail Trigger",
"type": "n8n-nodes-base.gmailTrigger",
"position": [
-912,
128
],
"parameters": {
"simple": false,
"filters": {},
"options": {},
"pollTimes": {
"item": [
{
"mode": "everyX",
"unit": "minutes",
"value": 15
}
]
}
},
"typeVersion": 1.2
},
{
"id": "fabeeec9-9900-44c9-9737-331d5eb1e927",
"name": "Label: High Priority",
"type": "n8n-nodes-base.gmail",
"position": [
-336,
-64
],
"parameters": {
"labelIds": [
"YOUR_LABEL_ID_HIGH_PRIORITY"
],
"messageId": "={{ $json.id }}",
"operation": "addLabels"
},
"typeVersion": 2.1
},
{
"id": "f6879258-e119-437f-8d07-9c9e9fb4977b",
"name": "Save Draft: High Priority",
"type": "n8n-nodes-base.gmail",
"options": {
"allowUnauthorizedCerts": false
},
"position": [
240,
-64
],
"parameters": {
"message": "{{ JSON.parse($json.message.content)['message'] || $json.message.content }}",
"options": {
"threadId": "={{ $('Gmail Trigger').item.json.threadId }}"
},
"subject": "{{ JSON.parse($json.message.content)['subject'] || `Re: ${$('Gmail Trigger').item.json.subject}` }}",
"resource": "draft"
},
"typeVersion": 2.1,
"alwaysOutputData": true
},
{
"id": "56d6cee5-34e0-4011-acf0-a8fa6edeadc5",
"name": "Label: Inquiry",
"type": "n8n-nodes-base.gmail",
"position": [
-336,
128
],
"parameters": {
"labelIds": [
"YOUR_LABEL_ID_INQUIRY"
],
"messageId": "={{ $json.id }}",
"operation": "addLabels"
},
"typeVersion": 2.1
},
{
"id": "d544643d-faf5-4b22-b534-34d26950f0a2",
"name": "Save Draft: Inquiry",
"type": "n8n-nodes-base.gmail",
"options": {
"allowUnauthorizedCerts": false
},
"position": [
240,
128
],
"parameters": {
"message": "{{ JSON.parse($json.message.content)['message'] || $json.message.content }}",
"options": {
"threadId": "={{ $('Gmail Trigger').item.json.threadId }}"
},
"subject": "{{ JSON.parse($json.message.content)['subject'] || `Re: ${$('Gmail Trigger').item.json.subject}` }}",
"resource": "draft"
},
"typeVersion": 2.1,
"alwaysOutputData": true
},
{
"id": "c07969cc-6dcd-44c0-9a1c-63d20dc61e4b",
"name": "Label: Finance/Billing",
"type": "n8n-nodes-base.gmail",
"position": [
-336,
320
],
"parameters": {
"labelIds": [
"YOUR_LABEL_ID_FINANCE"
],
"messageId": "={{ $json.id }}",
"operation": "addLabels"
},
"typeVersion": 2.1
},
{
"id": "712a6f08-8f71-4c13-8acb-b39b11d9f293",
"name": "Save Draft: Finance/Billing",
"type": "n8n-nodes-base.gmail",
"options": {
"allowUnauthorizedCerts": false
},
"position": [
240,
320
],
"parameters": {
"message": "{{ JSON.parse($json.message.content)['message'] || $json.message.content }}",
"options": {
"threadId": "={{ $('Gmail Trigger').item.json.threadId }}"
},
"subject": "{{ JSON.parse($json.message.content)['subject'] || `Re: ${$('Gmail Trigger').item.json.subject}` }}",
"resource": "draft"
},
"typeVersion": 2.1,
"alwaysOutputData": true
},
{
"id": "4cb47a6d-3e08-4a2f-b18f-af56ab5fd1d7",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-112,
512
],
"parameters": {
"content": "## Add your OpenAI API Key under \"Credentials\".\n"
},
"typeVersion": 1
},
{
"id": "9654f73d-d725-4c6c-a41e-9711da06f5c8",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-992,
304
],
"parameters": {
"content": "## Connect your Gmail account under \"Credentials\"."
},
"typeVersion": 1
},
{
"id": "92db5bbe-37bb-4edb-9637-5560b093b53e",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-432,
512
],
"parameters": {
"width": 288,
"height": 192,
"content": "## Replace YOUR_LABEL_ID_XXX\n with your Gmail label IDs (get them via Gmail \u2192 List Labels)."
},
"typeVersion": 1
},
{
"id": "9347757e-ae21-44b3-9a66-9b158e9496ed",
"name": "Gmail Category Classifier",
"type": "@n8n/n8n-nodes-langchain.textClassifier",
"position": [
-688,
128
],
"parameters": {
"options": {},
"inputText": "={{ $json.text }}",
"categories": {
"categories": [
{
"category": "High Priority",
"description": "Urgent matters requiring immediate attention: deadline/requirements changes, incident reports, or escalations from executives/key clients."
},
{
"category": "Promotions",
"description": "Newsletters, sales, and event ads. No urgent action required."
},
{
"category": "Inquiry",
"description": "Questions/requests from customers or teammates. Aim to reply within 24\u201348h with a clear answer."
},
{
"category": "Finance/Billing",
"description": "Invoices/quotes/payments/receipts/due dates. Handle in order of due date."
}
]
}
},
"typeVersion": 1.1
},
{
"id": "b79ab780-f6a2-4d29-a6da-2f05f38ac271",
"name": "Generate Draft: High Priority",
"type": "@n8n/n8n-nodes-langchain.openAi",
"options": {
"continueOnFail": true
},
"position": [
-112,
-64
],
"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "gpt-4o-mini",
"cachedResultName": "gpt-4o-mini"
},
"options": {},
"messages": {
"values": [
{
"content": "=You are an Executive Assistant. Goal: Draft a fast, accurate reply for emails classified as \"High Priority\". Input email body: {{ $('Gmail Trigger').item.json.text }} Output a JSON object: {\"subject\":\"...\",\"message\":\"...\"}. Rules: (1) Start with a short summary and list clarifying questions (requirements/deadline/unknowns). (2) Provide an initial/provisional answer where possible. (3) Default subject format: \"Re: {{ $('Gmail Trigger').item.json.subject }} | Action & Clarifications\" (adjust if needed). Keep tone concise and professional."
}
]
},
"jsonOutput": true
},
"typeVersion": 1.8
},
{
"id": "bc2956b4-4789-4747-854d-f3bc937cec23",
"name": "Generate Draft: Inquiry",
"type": "@n8n/n8n-nodes-langchain.openAi",
"options": {
"continueOnFail": true
},
"position": [
-112,
128
],
"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "gpt-4o-mini",
"cachedResultName": "gpt-4o-mini"
},
"options": {},
"messages": {
"values": [
{
"content": "=You are a Customer Support agent. Goal: Draft a polite, complete reply to an \"Inquiry\" email. Input: {{ $('Gmail Trigger').item.json.text }} Output JSON: {\"subject\":\"...\",\"message\":\"...\"}. Structure: (1) Brief summary of the ask, (2) Direct answer/steps, (3) Next actions and expected timeline, (4) Optional links to FAQ/help. Add a simple signature. Default subject: \"Re: {{ $('Gmail Trigger').item.json.subject }} | Response to Your Question\"."
}
]
},
"jsonOutput": true
},
"typeVersion": 1.8
},
{
"id": "955978cc-acde-4413-a11a-c197893d7ce8",
"name": "Generate Draft: Finance/Billing",
"type": "@n8n/n8n-nodes-langchain.openAi",
"options": {
"continueOnFail": true
},
"position": [
-112,
320
],
"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "gpt-4o-mini",
"cachedResultName": "gpt-4o-mini"
},
"options": {},
"messages": {
"values": [
{
"content": "=You are a Finance Assistant. Goal: Draft a precise reply for \"Finance/Billing\" emails. Input: {{ $('Gmail Trigger').item.json.text }} Output JSON: {\"subject\":\"...\",\"message\":\"...\"}. Rules: (1) Confirm key fields in bullets (amount, due date, bank info, invoice/PO numbers), (2) Request any missing docs (quote/PO/delivery note/receipt), (3) State due date or next step clearly. Default subject: \"Re: {{ $('Gmail Trigger').item.json.subject }} | Billing Clarifications\"."
}
]
},
"jsonOutput": true
},
"typeVersion": 1.8
},
{
"id": "5ea6f7ea-2b75-4038-8f1e-4bb1d0cc473d",
"name": "LLM Support Model",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"position": [
-624,
416
],
"parameters": {
"model": {
"__rl": true,
"mode": "list",
"value": "gpt-4.1-mini"
},
"options": {}
},
"typeVersion": 1.2
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "b8cb7ddb-65c0-4ca6-94b9-7d23cb801b2e",
"connections": {
"Gmail Trigger": {
"main": [
[
{
"node": "Gmail Category Classifier",
"type": "main",
"index": 0
}
]
]
},
"Label: Inquiry": {
"main": [
[
{
"node": "Generate Draft: Inquiry",
"type": "main",
"index": 0
}
]
]
},
"LLM Support Model": {
"ai_languageModel": [
[
{
"node": "Gmail Category Classifier",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Label: High Priority": {
"main": [
[
{
"node": "Generate Draft: High Priority",
"type": "main",
"index": 0
}
]
]
},
"Label: Finance/Billing": {
"main": [
[
{
"node": "Generate Draft: Finance/Billing",
"type": "main",
"index": 0
}
]
]
},
"Generate Draft: Inquiry": {
"main": [
[
{
"node": "Save Draft: Inquiry",
"type": "main",
"index": 0
}
]
]
},
"Gmail Category Classifier": {
"main": [
[
{
"node": "Label: High Priority",
"type": "main",
"index": 0
}
],
[],
[
{
"node": "Label: Inquiry",
"type": "main",
"index": 0
}
],
[
{
"node": "Label: Finance/Billing",
"type": "main",
"index": 0
}
]
]
},
"Generate Draft: High Priority": {
"main": [
[
{
"node": "Save Draft: High Priority",
"type": "main",
"index": 0
}
]
]
},
"Generate Draft: Finance/Billing": {
"main": [
[
{
"node": "Save Draft: Finance/Billing",
"type": "main",
"index": 0
}
]
]
}
}
}
Pro
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
About this workflow
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…
Source: https://n8n.io/workflows/8426/ — original creator credit. Request a take-down →
Related workflows
Workflows that share integrations, category, or trigger type with this one. All free to copy and import.
This n8n template demonstrates how to automate email classification, labeling, draft generation, and logging using Gmail, OpenAI, and Google Sheets. Use cases include customer support management, sale
Gmail Trigger, Gmail, Text Classifier +4
This n8n template uses AI to automatically classify incoming Gmail messages into five categories and route them to the right people or departments. It can also reply automatically and send WhatsApp al
Gmail Trigger, OpenAI Chat, Gmail +3
Detects new unread Gmail messages Extracts sender name for personalized replies Classifies the email into one of four categories Applies the correct Gmail label and either sends an auto-reply, creates
Gmail Trigger, OpenAI Chat, Gmail +4
Email Automation AI-Powered Operations Internal Productivity Tools
Gmail Trigger, Text Classifier, OpenAI Chat +3
This section automates Gmail message handling through AI-powered classification and response. Using the LangChain Text Classifier, incoming emails are analyzed and sorted into four categories — High P
Gmail Trigger, Text Classifier, OpenAI Chat +3