Reply to contact form leads via Gmail and Google Sheets using OpenAI GPT-4o mini

Quick overview

This workflow triggers on n8n form submissions, uses OpenAI (GPT-4o mini) to draft a short acknowledgment email, sends the auto-reply through Gmail, and appends the submission details to a Google Sheets spreadsheet.

How it works

1. Triggers when someone submits the n8n “Contact Us” form with their name, email, and message.
2. Sends the submission text to OpenAI (GPT-4o mini) to generate a warm auto-reply that promises a human follow-up within one business day.
3. Sends the generated reply to the submitter via Gmail with the subject “Thanks for reaching out!”.
4. Appends the form submission data to a Google Sheets worksheet for tracking.

Setup

1. Connect an OpenAI credential for the Chat model used to generate the email reply.
2. Connect a Gmail account credential and confirm the workflow is allowed to send email from that mailbox.
3. Connect a Google Sheets credential, replace the spreadsheet URL/ID in the Google Sheets step, and ensure the target sheet tab is named “Leads” (or update it to match your sheet).