🧠 Email real time RAG Assistant with Gmail, OpenAI & PGVector

📌 Who’s it for

This workflow is ideal for:

• Professionals
• Project managers
• Sales and support teams
• Anyone managing high volumes of Gmail messages

It enables fast and intelligent search through your email inbox using natural language queries.

⚙️ How it works / What it does

• Continuously monitors your Gmail inbox for new emails.
• Extracts email content and metadata (subject, body, sender, date).
• Converts email content into vector embeddings using OpenAI.
• Stores embeddings in a PostgreSQL database with PGVector.
• A conversational AI agent performs semantic search on your stored email history.
• Supports time-sensitive and context-aware responses via OpenAI Chat model.

🚀 How to set up

1. Connect your Gmail account to the Gmail Trigger node (with API access enabled).
2. Configure OpenAI credentials for the Embedding and Chat nodes.
3. Set up a PostgreSQL database with the PGVector extension enabled.
4. Import the workflow into your n8n instance (Cloud or Self-hosted).
5. Customize parameters like polling frequency, embedding settings, or vector query depth.

📋 Requirements

• ✅ n8n instance (Self-hosted or Cloud)
• ✅ Gmail account with API access
• ✅ OpenAI API Key
• ✅ PostgreSQL database with PGVector extension installed

🛠️ How to customize the workflow

• Email Filtering : Change filters in the Gmail Trigger to watch specific labels or senders.
• Text Splitting Granularity : Adjust chunkSize and chunkOverlap in the text splitter node.
• Query Depth : Modify topK in the vector search node to retrieve more or fewer similar results.
• Prompt Tuning : Customize the system message or agent instructions in the RAG node.
• Workflow Extensions : Add notifications, error logging, Slack/Telegram alerts, or data exports.