Haruki Kuwai This workflow corresponds to n8n.io template #10118 — 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": "6MZqIrk7nB6lc4vB",
"meta": {
"templateCredsSetupCompleted": true
},
"name": "Gmail Auto Reply & Categorization with AI",
"tags": [],
"nodes": [
{
"id": "9f88a550-a517-4362-a71f-b7997b9c75fa",
"name": "Gmail Trigger",
"type": "n8n-nodes-base.gmailTrigger",
"position": [
-272,
0
],
"parameters": {
"simple": false,
"filters": {},
"options": {},
"pollTimes": {
"item": [
{
"mode": "everyMinute"
}
]
}
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 1.2
},
{
"id": "faf382e9-f898-447f-b5a1-d7a8c28d2309",
"name": "Text Classifier",
"type": "@n8n/n8n-nodes-langchain.textClassifier",
"position": [
-96,
-32
],
"parameters": {
"options": {},
"inputText": "={{ $json.text }}",
"categories": {
"categories": [
{
"category": "High Priority",
"description": "Description: Emails that require immediate attention and could have a serious impact if delayed. Typical examples include: system outages, security alerts, critical legal notices, or urgent requests from executives or key clients. Examples: '[URGENT] Service outage notice', '[IMPORTANT] Contract renewal deadline'"
},
{
"category": "Advertisement",
"description": "Description: Marketing or promotional emails that do not require an immediate response. Typical examples include: sales announcements, product launches, newsletters, and event invitations. Examples: '[LIMITED OFFER] 50% off campaign', 'New service release announcement'"
},
{
"category": "Inquiry",
"description": "Description: Customer or partner inquiries that require a reply or follow-up. Typical examples include: product or service questions, quote requests, reservations, troubleshooting, repair or refund requests. Examples: 'Inquiry about studio reservation', 'Request for quotation'"
},
{
"category": "Finance/Billing",
"description": "Description: Emails related to payments, invoices, or financial transactions. Typical examples include: invoices, receipts, payment confirmations, bank or accounting notifications, and tax-related documents. Examples: 'Invoice submission notice', '[Payment confirmed] Thank you for your payment'"
}
]
}
},
"typeVersion": 1.1
},
{
"id": "aaddb0e0-fd5f-49ab-8887-f3ecc5bd9d89",
"name": "OpenAI Chat Model",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"position": [
-96,
208
],
"parameters": {
"model": {
"__rl": true,
"mode": "list",
"value": "gpt-4.1-mini"
},
"options": {
"maxRetries": 1
}
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"typeVersion": 1.2
},
{
"id": "52265538-92f0-45b9-a7e8-78ba934620cf",
"name": "Save Priority Mail",
"type": "n8n-nodes-base.gmail",
"position": [
432,
-240
],
"parameters": {
"labelIds": [
"Label_6395372519299544115"
],
"messageId": "={{ $json.id }}",
"operation": "addLabels"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "a3ac1d27-05ca-4832-bee9-176899915b27",
"name": "Save Advertisement Mail",
"type": "n8n-nodes-base.gmail",
"position": [
432,
-48
],
"parameters": {
"labelIds": [
"Label_2877175876700118240"
],
"messageId": "={{ $json.id }}",
"operation": "addLabels"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "696b4433-3093-436c-b98d-2f910858823e",
"name": "Save Inquiry Mail",
"type": "n8n-nodes-base.gmail",
"position": [
432,
144
],
"parameters": {
"labelIds": [
"Label_8971387974199578288"
],
"messageId": "={{ $json.id }}",
"operation": "addLabels"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "68f89db1-59b8-4b15-8ac6-52354a28093a",
"name": "Save Finance Mail",
"type": "n8n-nodes-base.gmail",
"position": [
432,
336
],
"parameters": {
"labelIds": [
"Label_7818902445747119871"
],
"messageId": "={{ $json.id }}",
"operation": "addLabels"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "cdb0c68f-e041-47ef-b65e-14e2c476a760",
"name": "Generate Priority Draft",
"type": "@n8n/n8n-nodes-langchain.openAi",
"position": [
640,
-240
],
"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "gpt-4o",
"cachedResultName": "GPT-4O"
},
"options": {},
"messages": {
"values": [
{
"content": "=You are an executive assistant. \nYour task is to reply accurately to high-priority incoming emails. \nHere is the email you need to respond to: {{ $('Gmail Trigger').item.json.text }} \n\nPlease output the following parameters:\n- Subject \n- Message\n"
}
]
},
"jsonOutput": true
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"executeOnce": false,
"typeVersion": 1.8,
"alwaysOutputData": false
},
{
"id": "a59b0fc2-b11e-4e9c-a5c6-b5aa33f85bac",
"name": "Generate Ad Summary",
"type": "@n8n/n8n-nodes-langchain.openAi",
"position": [
640,
-48
],
"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "gpt-4o",
"cachedResultName": "GPT-4O"
},
"options": {},
"messages": {
"values": [
{
"content": "=You are a marketing specialist. \nYour task is to summarize incoming promotional or marketing emails concisely in 1\u20132 lines for spreadsheet logging. \n\nHere is the received email: {{ $('Gmail Trigger').item.json.text }}\n\nPlease extract and summarize the following fields:\n- Sender \n- Subject \n- Summary \n- Recommendation\n"
}
]
},
"jsonOutput": true
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"executeOnce": false,
"typeVersion": 1.8,
"alwaysOutputData": false
},
{
"id": "64f4df61-ee88-4ea0-857f-7d738c2f3c21",
"name": "Generate Finance Summary",
"type": "@n8n/n8n-nodes-langchain.openAi",
"position": [
640,
144
],
"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "gpt-4o",
"cachedResultName": "GPT-4O"
},
"options": {},
"messages": {
"values": [
{
"content": "=You are a customer service representative. \nYour task is to reply accurately to customer inquiries. \nIf the question cannot be answered, instruct the sender to contact the following number: 000-0000-000. \n\nHere is the email you need to respond to: {{ $('Gmail Trigger').item.json.text }}\n\nPlease output the following parameters:\n- Subject \n- Message\n"
}
]
},
"jsonOutput": true
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"executeOnce": false,
"typeVersion": 1.8,
"alwaysOutputData": false
},
{
"id": "a8df46ff-73f7-4129-94cb-0f452b328716",
"name": "Generate Inquiry Reply",
"type": "@n8n/n8n-nodes-langchain.openAi",
"position": [
640,
336
],
"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "gpt-4o",
"cachedResultName": "GPT-4O"
},
"options": {},
"messages": {
"values": [
{
"content": "=You are a finance and billing assistant. \nYour task is to summarize emails related to invoices, payments, and financial notifications in a concise manner. \n\nHere is the received email: {{ $('Gmail Trigger').item.json.text }}\n\nPlease output the following parameters:\n- Subject \n- Message\n"
}
]
},
"jsonOutput": true
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"executeOnce": false,
"typeVersion": 1.8,
"alwaysOutputData": false
},
{
"id": "ef15e762-463f-4acd-9c38-cb84735c9feb",
"name": "Create Draft",
"type": "n8n-nodes-base.gmail",
"position": [
992,
-240
],
"parameters": {
"message": "={{ $json.message.content['message'] }}",
"options": {},
"subject": "={{ $json.message.content['send'] }}",
"resource": "draft"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "45aa5109-f0c2-43e7-a91a-db0fcc109cc7",
"name": "Append Row to Sheet",
"type": "n8n-nodes-base.googleSheets",
"position": [
992,
-48
],
"parameters": {
"columns": {
"value": {
"Sender": "={{ $json.message.content['Sender'] }}",
"Subject": "={{ $json.message.content['Subject'] }}",
"Summary": "={{ $json.message.content['Summary'] }}",
"Recommendation": "={{ $json.message.content['Recommendation'] }}"
},
"schema": [
{
"id": "Sender",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "Sender",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Subject",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "Subject",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Summary",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "Summary",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "Recommendation",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "Recommendation",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [],
"attemptToConvertTypes": false,
"convertFieldsToString": false
},
"options": {},
"operation": "append",
"sheetName": {
"__rl": true,
"mode": "list",
"value": "gid=0",
"cachedResultUrl": "https://docs.google.com/spreadsheets/d/13AmknC94wJ5n1FDl7E1yUFsCNYVDJklzPpTZmFQrMb4/edit#gid=0",
"cachedResultName": "01_Advertisement Mail Summary"
},
"documentId": {
"__rl": true,
"mode": "list",
"value": "13AmknC94wJ5n1FDl7E1yUFsCNYVDJklzPpTZmFQrMb4",
"cachedResultUrl": "https://docs.google.com/spreadsheets/d/13AmknC94wJ5n1FDl7E1yUFsCNYVDJklzPpTZmFQrMb4/edit?usp=drivesdk",
"cachedResultName": "[n8n] Advertisement Mail Summary"
}
},
"credentials": {
"googleSheetsOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 4.6
},
{
"id": "6701a84f-2e2a-42f2-9c98-fb7ee3f394f1",
"name": "Send Finance Mail",
"type": "n8n-nodes-base.gmail",
"position": [
992,
144
],
"parameters": {
"message": "={{ $json.message.content['message'] }}",
"options": {},
"resource": "thread",
"threadId": "={{ $('Save Inquiry Mail').item.json.threadId }}",
"messageId": "={{ $('Save Inquiry Mail').item.json.id }}",
"operation": "reply"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "89129a16-1f1a-48e4-82f1-0593c142909b",
"name": "Reply to Inquiry",
"type": "n8n-nodes-base.gmail",
"position": [
992,
336
],
"parameters": {
"sendTo": "{{YOUR_EMAIL_ADDRESS}}",
"message": "={{ $json.message.content['message'] }}",
"options": {},
"subject": "={{ $json.message.content['send'] }}"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "6f1a41f5-ad3e-4b4b-906d-44a20bbe0623",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
1264,
-304
],
"parameters": {
"width": 416,
"height": 880,
"content": "## \ud83d\udce9Gmail Auto Reply & Categorization with AI (LangChain + OpenAI + Google Sheets)\n\n**Description:**\nThis workflow automatically categorizes incoming Gmail messages into four types \u2014 High Priority, Advertisement, Inquiry, and Finance/Billing \u2014 using the LangChain Text Classifier.\nEach category triggers a specific automated action powered by OpenAI GPT models:\n\n\ud83d\udfe5 High Priority: Generates an AI-written draft reply in Gmail.\n\n\ud83d\udfe8 Advertisement: Summarizes the content and logs it to Google Sheets.\n\n\ud83d\udfe9 Inquiry: Creates an auto-reply email with fallback instructions.\n\n\ud83d\udfe6 Finance/Billing: Generates a brief summary and forwards it to a designated address.\n\nThis setup combines Gmail + LangChain + OpenAI + Google Sheets for a complete AI-driven email management system that reduces manual sorting and response time.\n\n**Setup Instructions:**\n\nConnect your credentials for Gmail, Google Sheets, and OpenAI.\n\nReplace all placeholders such as {{YOUR_EMAIL_ADDRESS}}, {{YOUR_SPREADSHEET_ID}}, and label names with your actual values.\n\nMake sure you have Gmail labels created for \u201cAdvertisement,\u201d \u201cInquiry,\u201d etc.\n\n(Optional) Translate prompts back to your language if needed.\n"
},
"typeVersion": 1
},
{
"id": "49d044e4-0a1c-4fff-b205-77d43db01251",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-336,
-176
],
"parameters": {
"color": 2,
"width": 512,
"height": 496,
"content": "## \u2460Receive Gmail \u2192 AI understands the email content\nIncoming emails are analyzed by AI and automatically categorized into four sections: High Priority, Advertisement, Inquiry, and Finance/Billing."
},
"typeVersion": 1
},
{
"id": "904ff69b-74bc-4c26-aa3d-5af797548e7e",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
272,
-624
],
"parameters": {
"width": 960,
"height": 1200,
"content": "## \u2461Email Processing Section\n**Flow Overview:**\nThis workflow automatically classifies all incoming Gmail messages into four categories using the LangChain Text Classifier and performs specific actions for each:\n\n\ud83d\udfe5 High Priority: Gmail adds a \u201cHigh Priority\u201d label \u2192 OpenAI generates a reply draft \u2192 saved as a Gmail draft.\n\n\ud83d\udfe8 Advertisement: AI summarizes the email \u2192 summary is recorded into a Google Sheet for later review.\n\n\ud83d\udfe9 Inquiry: AI generates an automatic customer reply \u2192 sends a polite response or fallback message.\n\n\ud83d\udfe6 Finance/Billing: AI creates a short summary of financial or billing-related content \u2192 forwards it to a designated email address.\n\n**Purpose:**\nThe system ensures that each type of incoming email is handled automatically and intelligently: urgent messages are drafted quickly, promotional content is logged, customer inquiries are answered promptly, and financial communications are safely redirected \u2014 all through a single AI-powered workflow."
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "fa5d38ad-f0cb-4b9a-962d-295da7453ed7",
"connections": {
"Gmail Trigger": {
"main": [
[
{
"node": "Text Classifier",
"type": "main",
"index": 0
}
]
]
},
"Text Classifier": {
"main": [
[
{
"node": "Save Priority Mail",
"type": "main",
"index": 0
}
],
[
{
"node": "Save Advertisement Mail",
"type": "main",
"index": 0
}
],
[
{
"node": "Save Inquiry Mail",
"type": "main",
"index": 0
}
],
[
{
"node": "Save Finance Mail",
"type": "main",
"index": 0
}
]
]
},
"OpenAI Chat Model": {
"ai_languageModel": [
[
{
"node": "Text Classifier",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Save Finance Mail": {
"main": [
[
{
"node": "Generate Inquiry Reply",
"type": "main",
"index": 0
}
]
]
},
"Save Inquiry Mail": {
"main": [
[
{
"node": "Generate Finance Summary",
"type": "main",
"index": 0
}
]
]
},
"Save Priority Mail": {
"main": [
[
{
"node": "Generate Priority Draft",
"type": "main",
"index": 0
}
]
]
},
"Generate Ad Summary": {
"main": [
[
{
"node": "Append Row to Sheet",
"type": "main",
"index": 0
}
]
]
},
"Generate Inquiry Reply": {
"main": [
[
{
"node": "Reply to Inquiry",
"type": "main",
"index": 0
}
]
]
},
"Generate Priority Draft": {
"main": [
[
{
"node": "Create Draft",
"type": "main",
"index": 0
}
]
]
},
"Save Advertisement Mail": {
"main": [
[
{
"node": "Generate Ad Summary",
"type": "main",
"index": 0
}
]
]
},
"Generate Finance Summary": {
"main": [
[
{
"node": "Send Finance Mail",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
gmailOAuth2googleSheetsOAuth2ApiopenAiApi
Pro
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About this workflow
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 Priority, Advertisement, Inquiry, and Finance/Billing — each triggering a…
Source: https://n8n.io/workflows/10118/ — original creator credit. Request a take-down →
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