Gmail Auto-Reply with AI

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 →

{
  "name": "gmailAutoResponse",
  "nodes": [
    {
      "parameters": {
        "pollTimes": {
          "item": [
            {
              "mode": "everyMinute"
            }
          ]
        },
        "filters": {}
      },
      "type": "n8n-nodes-base.gmailTrigger",
      "typeVersion": 1.3,
      "position": [
        0,
        0
      ],
      "id": "0e5753cd-952d-4f84-8685-99ebd4c8f296",
      "name": "Gmail Trigger",
      "credentials": {
        "gmailOAuth2": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "modelId": {
          "__rl": true,
          "value": "gpt-4o-mini",
          "mode": "list",
          "cachedResultName": "GPT-4O-MINI"
        },
        "messages": {
          "values": [
            {
              "content": "=write a reply mail for the below:\nsubject:  {{ $json.Subject }}\nfrom: {{ $json.From }}\nContent: {{ $json.snippet }}\n\n"
            },
            {
              "content": "You're a expert in writing professional email \n\n\n# only write the body message no subject\n# Draft the mail in good format:\ngreeting message and then new line messages and then\nfooter.\n\nStrictly use the below format spacing and new line need to be same\n\nexamples:\nHi  <name>,\n\n<message content>\n\nThanks & Regards,\nPaarib",
              "role": "system"
            }
          ]
        },
        "options": {
          "temperature": 0.7
        }
      },
      "type": "@n8n/n8n-nodes-langchain.openAi",
      "typeVersion": 1.8,
      "position": [
        224,
        0
      ],
      "id": "6f10dcb7-6e8f-4dc6-af36-5d3b2151c4ec",
      "name": "Message a model",
      "credentials": {
        "openAiApi": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "operation": "reply",
        "messageId": "={{ $('Gmail Trigger').item.json.id }}",
        "message": "={{ $json.message.content }}",
        "options": {}
      },
      "type": "n8n-nodes-base.gmail",
      "typeVersion": 2.1,
      "position": [
        576,
        0
      ],
      "id": "d15f89b2-5a80-42c2-ad7b-f9c8f67faf32",
      "name": "Reply to a message",
      "credentials": {
        "gmailOAuth2": {
          "name": "<your credential>"
        }
      }
    }
  ],
  "connections": {
    "Gmail Trigger": {
      "main": [
        [
          {
            "node": "Message a model",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Message a model": {
      "main": [
        [
          {
            "node": "Reply to a message",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {
    "executionOrder": "v1"
  },
  "versionId": "01a5212d-6046-44fd-87ee-0945691b3c65",
  "meta": {
    "templateCredsSetupCompleted": true
  },
  "id": "N9gxZxptaTa10jMF",
  "tags": []
}

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.

• gmailOAuth2
• openAiApi

About this workflow

gmailAutoResponse. Uses gmailTrigger, openAi, gmail. Event-driven trigger; 3 nodes.

Source: https://github.com/paari24/genAI/blob/30bfbd32b1e76049e3795e5e94449ce5c7a2d915/n8n/gmailAutoResponse.json — original creator credit. Request a take-down →

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