Bohdan Saranchuk This workflow corresponds to n8n.io template #9376 — 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
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{
"id": "kKdyG8BnQcQ6re5y",
"name": "Gmail-Slack",
"tags": [],
"nodes": [
{
"id": "254da1f8-b8e6-44fb-b526-fa8f4181e3fd",
"name": "Gmail Trigger",
"type": "n8n-nodes-base.gmailTrigger",
"position": [
-1248,
144
],
"parameters": {
"filters": {
"readStatus": "unread"
},
"pollTimes": {
"item": [
{
"mode": "everyMinute"
}
]
}
},
"typeVersion": 1.3
},
{
"id": "a6929e80-8db0-4c8a-83b1-345f68b5d2bc",
"name": "Send a message",
"type": "n8n-nodes-base.slack",
"position": [
0,
0
],
"parameters": {
"text": "=New support request received from {{ $('Gmail Trigger').item.json.From }}\nSubject: {{ $('Gmail Trigger').item.json.Subject }}\nContent: {{ $('Gmail Trigger').item.json.snippet }}\n",
"select": "channel",
"channelId": {
"__rl": true,
"mode": "list",
"value": "C09EVCZR4P6",
"cachedResultName": "support"
},
"otherOptions": {},
"authentication": "oAuth2"
},
"typeVersion": 2.3
},
{
"id": "5e546936-0738-4260-9d7a-cabdf09869bf",
"name": "Message a model",
"type": "@n8n/n8n-nodes-langchain.openAi",
"position": [
-560,
160
],
"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "chatgpt-4o-latest",
"cachedResultName": "CHATGPT-4O-LATEST"
},
"options": {},
"messages": {
"values": [
{
"role": "system",
"content": "=You are an email triage classifier. Return ONLY a JSON object:\n{\"category\":\"support|new-request|enquiry|general|spam|other\"}"
},
{
"content": "=Subject: {{ $('Gmail Trigger').item.json.Subject }}\nContent: {{ $('Gmail Trigger').item.json.snippet }}"
}
]
},
"jsonOutput": true
},
"typeVersion": 1.8
},
{
"id": "bcbca08b-7d32-4f62-b543-bfb4c15e260c",
"name": "Create a row",
"type": "n8n-nodes-base.supabase",
"position": [
256,
160
],
"parameters": {
"tableId": "threads",
"fieldsUi": {
"fieldValues": [
{
"fieldId": "thread_id",
"fieldValue": "={{ $('Gmail Trigger').item.json.threadId }}"
},
{
"fieldId": "first_message_id",
"fieldValue": "={{ $('Gmail Trigger').item.json.id }}"
},
{
"fieldId": "from_addr",
"fieldValue": "={{ $('Gmail Trigger').item.json.From }}"
},
{
"fieldId": "subject",
"fieldValue": "={{ $('Gmail Trigger').item.json.Subject }}"
}
]
}
},
"typeVersion": 1
},
{
"id": "a3a48ec5-5578-43f7-ae99-3c6785f090f7",
"name": "Get a row",
"type": "n8n-nodes-base.supabase",
"position": [
-1040,
144
],
"parameters": {
"filters": {
"conditions": [
{
"keyName": "thread_id",
"keyValue": "={{ $json.threadId }}"
}
]
},
"tableId": "threads",
"operation": "get"
},
"typeVersion": 1,
"alwaysOutputData": true
},
{
"id": "fcae3538-c417-4f84-ac3b-f95bcc7fb4e5",
"name": "If",
"type": "n8n-nodes-base.if",
"position": [
-832,
144
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "7ff63d14-3ae6-4fa1-bfc4-dfa9df41b74f",
"operator": {
"type": "string",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{ $json.thread_id }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "6c8fbfa6-e0e1-461f-8c53-c2741e36090b",
"name": "Switch",
"type": "n8n-nodes-base.switch",
"position": [
-208,
160
],
"parameters": {
"rules": {
"values": [
{
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "7f361c76-9d64-4100-92f2-3176a77539ed",
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.message.content.category }}",
"rightValue": "support"
}
]
}
},
{
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "0996814e-5fd0-480f-92e1-9bb8b52d6649",
"operator": {
"name": "filter.operator.equals",
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.message.content.category }}",
"rightValue": "new-request"
}
]
}
}
]
},
"options": {}
},
"typeVersion": 3.2
},
{
"id": "34441930-fdd6-49dd-8b04-f43f9f6831c9",
"name": "Mark a message as read",
"type": "n8n-nodes-base.gmail",
"position": [
464,
160
],
"parameters": {
"messageId": "={{ $('Gmail Trigger').item.json.id }}",
"operation": "markAsRead"
},
"typeVersion": 2.1
},
{
"id": "92d379d7-81e2-41d5-a927-1a8d3ad314ab",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1328,
-80
],
"parameters": {
"color": 4,
"width": 224,
"height": 192,
"content": "## 1. Gmail Trigger\n\ud83d\udcec Triggers whenever a new unread email arrives in the connected Gmail inbox.\n\n\u27a1\ufe0f Sends email data (From, Subject, Snippet, Thread ID, etc.) to the next node."
},
"typeVersion": 1
},
{
"id": "14d334bf-cc9d-414a-a026-833ad0e00bd1",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1088,
-48
],
"parameters": {
"content": "## 2. Get a row (Supabase) \n\ud83d\udd0d Checks Supabase table \u201cthreads\u201d to see if this email thread already exists."
},
"typeVersion": 1
},
{
"id": "d941485f-c582-450d-a55e-364dbeda6127",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-832,
-48
],
"parameters": {
"color": 2,
"content": "## 3. IF Node\n\u2753Decision point:\n\t\u2022\tIf thread exists, stop (no duplicate processing).\n\t\u2022\tIf thread does not exist, continue workflow."
},
"typeVersion": 1
},
{
"id": "ad5020dc-fe2a-46b1-b179-4f5dd0f20668",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
-576,
-80
],
"parameters": {
"color": 4,
"width": 256,
"height": 192,
"content": "## 4. Message a Model (OpenAI)\n\ud83e\udde0 Sends the email subject and snippet to ChatGPT (4o) to classify the email into a category:\nsupport | new-request | enquiry | general | spam | other"
},
"typeVersion": 1
},
{
"id": "4cf815f4-70ca-4bd9-a2ee-af021df944a6",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
-304,
-80
],
"parameters": {
"color": 6,
"height": 192,
"content": "## 5. Switch\n\ud83d\udd00 Routes the email based on the category returned by ChatGPT:\n\t\u2022\tIf \u201csupport\u201d \u2192 send to #support channel.\n\t\u2022\tIf \u201cnew-request\u201d \u2192 send to #new-requests channel.\n"
},
"typeVersion": 1
},
{
"id": "b8f9c6ea-61a9-4be2-a4a0-29d90caa8cf6",
"name": "Send a message 2",
"type": "n8n-nodes-base.slack",
"position": [
0,
256
],
"parameters": {
"text": "=New request received from {{ $('Gmail Trigger').item.json.From }} Subject: {{ $('Gmail Trigger').item.json.Subject }} Content: {{ $('Gmail Trigger').item.json.snippet }}",
"select": "channel",
"channelId": {
"__rl": true,
"mode": "list",
"value": "C09EQ9Q1Z3R",
"cachedResultName": "new-requests"
},
"otherOptions": {},
"authentication": "oAuth2"
},
"typeVersion": 2.3
},
{
"id": "3fe1a77a-3feb-49a6-8941-1ab666bf6cc5",
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"position": [
-48,
-240
],
"parameters": {
"color": 4,
"height": 208,
"content": "## 6. Send a Message (Slack)\n\ud83d\udcac Posts formatted message in the #support Slack channel:\n\n\u201cNew support request received from [email]. Subject: [\u2026]. Content: [\u2026]\u201d"
},
"typeVersion": 1
},
{
"id": "3f4a8b97-9b38-4de8-8a51-e023b43a493f",
"name": "Sticky Note6",
"type": "n8n-nodes-base.stickyNote",
"position": [
-32,
416
],
"parameters": {
"color": 4,
"width": 256,
"height": 208,
"content": "## 7. Send a Message 2 (Slack)\n\ud83d\udcac Posts formatted message in the #new-requests Slack channel:\n\n\u201cNew request received from [email]. Subject: [\u2026]. Content: [\u2026]\u201d"
},
"typeVersion": 1
},
{
"id": "5a3324e6-ab62-465d-8854-54c2cf59098d",
"name": "Sticky Note7",
"type": "n8n-nodes-base.stickyNote",
"position": [
208,
-64
],
"parameters": {
"color": 5,
"height": 192,
"content": "## 8. Create a Row (Supabase)\n\ud83d\uddc3\ufe0f Adds a new record in the \u201cthreads\u201d table:\nStores thread_id, first_message_id, from_addr, subject for future deduplication."
},
"typeVersion": 1
},
{
"id": "665325de-a9fb-4440-95b0-a1c197d79053",
"name": "Sticky Note8",
"type": "n8n-nodes-base.stickyNote",
"position": [
464,
-32
],
"parameters": {
"color": 7,
"content": "## 9. Mark a Message as Read (Gmail)\n\u2705 Marks the email as read in Gmail once it\u2019s processed and saved."
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "04bdb1d8-234b-4623-a56c-f4c3593910c6",
"connections": {
"If": {
"main": [
[],
[
{
"node": "Message a model",
"type": "main",
"index": 0
}
]
]
},
"Switch": {
"main": [
[
{
"node": "Send a message",
"type": "main",
"index": 0
}
],
[
{
"node": "Send a message 2",
"type": "main",
"index": 0
}
]
]
},
"Get a row": {
"main": [
[
{
"node": "If",
"type": "main",
"index": 0
}
]
]
},
"Create a row": {
"main": [
[
{
"node": "Mark a message as read",
"type": "main",
"index": 0
}
]
]
},
"Gmail Trigger": {
"main": [
[
{
"node": "Get a row",
"type": "main",
"index": 0
}
]
]
},
"Send a message": {
"main": [
[
{
"node": "Create a row",
"type": "main",
"index": 0
}
]
]
},
"Message a model": {
"main": [
[
{
"node": "Switch",
"type": "main",
"index": 0
}
]
]
},
"Send a message 2": {
"main": [
[
{
"node": "Create a row",
"type": "main",
"index": 0
}
]
]
}
}
}
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About this workflow
• The OpenAI API is used for automatic email classification, which incurs a small per-request cost. See OpenAI Pricing for up-to-date info. • You can easily expand the categories or connect more Slack channels to fit your workflow. • The Supabase integration ensures you don’t…
Source: https://n8n.io/workflows/9376/ — original creator credit. Request a take-down →
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