Automate Gmail Replies with AI-Powered Workflow in n8n

Transform your Gmail inbox into an intelligent email management system that automatically classifies incoming messages and drafts AI-powered replies using your company's knowledge base. This n8n workflow combines Gmail monitoring, OpenRouter AI classification, and Google Docs integration to streamline your email response process while maintaining professional, accurate communication.

What this workflow does

This automated Gmail reply system operates continuously to manage your email communications:

• Real-time monitoring: Triggers every minute to fetch new unread Gmail messages automatically
• Smart classification: Uses OpenRouter-powered AI to analyze email subject, sender, and body content, categorizing each message as "Relevant" or "Irrelevant"
• Intelligent reply generation: For relevant emails, deploys an OpenRouter AI agent to craft professional responses
• Knowledge-base integration: Retrieves company information from your specified Google Docs document to ensure accurate, contextual replies
• Draft creation: Automatically saves generated responses as Gmail drafts in the original email thread, addressed to the original sender

Use cases

Perfect for SaaS operators and automation engineers who need to:

• Manage high-volume customer support inquiries with consistent, informed responses
• Ensure team members never miss important emails while filtering out irrelevant messages
• Maintain professional communication standards using company-specific information and tone
• Reduce email response time while preserving human oversight through the draft system
• Scale email operations without sacrificing personalization or accuracy

Technical details

Built with essential n8n integrations:

• Gmail nodes: Gmail trigger and Gmail integration for email monitoring and draft creation
• AI processing: n8n-nodes-langchain text classifier and agent nodes powered by OpenRouter
• Knowledge management: Google Docs tool integration for company information retrieval
• Authentication: Gmail OAuth2 and Google Docs OAuth2 credentials, plus OpenRouter API integration

Simply connect your Gmail and Google Docs OAuth2 credentials, add your OpenRouter API key, and specify your company knowledge base document URL to start automating intelligent email replies.