Gmail Support Email Auto-Reply with OpenAI & Pinecone (n8n)

Automatically reply to Gmail support emails using OpenAI + Pinecone (n8n workflow)

This n8n workflow watches your Gmail inbox for new unread messages, classifies whether they’re support requests, searches your Pinecone knowledge base for the best help articles, and drafts (or sends) an accurate auto-reply in the original email thread—or escalates unclear cases to your support team.

What this workflow does

• Monitors Gmail every minute for new unread emails in your specified inbox (excluding messages sent from your own account).
• Normalizes incoming messages into a clean structure (sender, subject, message text, plus thread/message IDs) and drops auto-replies, empty emails, or messages missing a usable sender.
• Classifies support vs. non-support using OpenAI Chat Completions with a keyword fallback. Non-support messages are routed out without replying.
• Escalates sensitive or uncertain requests (e.g., complaints, refunds, legal, cancellations, or low-confidence classifications) by preparing an internal alert email to your support address.
• Searches help content in Pinecone by embedding the user’s question with OpenAI and retrieving the top matching knowledge chunks (or using a built-in demo knowledge base if Pinecone isn’t configured).
• Generates a reply with safeguards: if the best match exceeds a configured score threshold, it drafts a response using OpenAI constrained to the retrieved excerpts (or uses a template when OpenAI is disabled). Otherwise, it escalates to a person.
• Respects preview/test/live mode: it can show the drafted reply, send a test copy to a specified address, or email the response in production.

Use cases

• Reduce support response time for SaaS operators handling frequent Gmail inquiries.
• Provide consistent answers by grounding replies in Pinecone-indexed documentation.
• Protect your team by auto-escalating refund, legal, and cancellation requests.

Technical details

• n8n nodes/tools: Gmail Trigger, Gmail (reply/escalation), OpenAI via HTTP Request (Chat Completions), Pinecone (retrieval), Code, if, Sticky Note.
• Core flow: classify → retrieve Pinecone chunks → threshold check → draft constrained response → reply or escalate.