Automatically Label Gmail Emails with GPT-5 Classification

How it works

This workflow automatically monitors your Gmail inbox and uses OpenAI's GPT model to intelligently classify incoming emails into four key categories:

• High Priority - Urgent emails requiring immediate attention from executives, clients, or stakeholders
• Promotion - Marketing emails, sales offers, product launches, and event invitations
• Finance/Billing - Invoices, receipts, payment notifications, and financial records
• Customer Support - Help requests, troubleshooting queries, and service-related issues

Once classified, emails are automatically labeled in Gmail using the appropriate tags, making it easy to filter, search, and prioritize your communications.

How to set up

Requirements

• Gmail account with OAuth2 access enabled
• OpenAI API key with GPT model access
• Custom Gmail labels created for each category

Step-by-step setup

1. Create Gmail Labels

• In Gmail, create these labels: "High Priority", "Promotion", "Finance/Billing", "Customer Support"
• Note the label IDs (you'll need to replace the hardcoded ones in the workflow)

1. Configure Credentials

• Add your Gmail OAuth2 credentials in n8n
• Add your OpenAI API credentials

1. Update Label IDs

• Replace the hardcoded label IDs in each Gmail node with your actual label IDs
• You can find label IDs by testing the Gmail node or using Gmail API

1. Adjust Classification Rules

• Review the Text Classifier categories and modify descriptions to match your specific needs
• Add or remove categories as required

1. Set Polling Frequency

• The workflow is set to check every minute - adjust based on your email volume