Automate Email Triage with GPT-4.1-mini Classification and Gmail Auto-Replies

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Built by Giovanni Beggiato Giovanni Beggiato
Created on June 08, 2026

Description

How it works:
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 a draft, or logs the contact in Google Sheets

Setup steps:
Takes about 5–10 minutes to connect accounts and set labels
Connect Gmail, OpenAI, and optional Google Sheets in n8n
Add label IDs, Google Sheet ID, sheet name, and phone number in Set – Config
Create four Gmail labels for the categories
Keep full setup instructions in the sticky notes inside the workflow

Nodes Used (6)

Gmail
n8n-nodes-base.gmail
Google Sheets
n8n-nodes-base.googleSheets
Information Extractor
@n8n/n8n-nodes-langchain.informationExtractor
OpenAI
@n8n/n8n-nodes-langchain.openAi
OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatOpenAi
Text Classifier
@n8n/n8n-nodes-langchain.textClassifier