n8n Lead Qualification: GPT-4o-mini + Gmail Outreach

Turn every inbound lead into a qualified, personalized outreach email—automatically

This n8n workflow receives lead form submissions through a webhook, uses OpenAI (GPT-4o-mini) to qualify the lead and craft a personalized email opener, logs results to Google Sheets, and sends outreach to qualified leads via Gmail.

What this workflow does

• Receives lead submissions via a webhook lead-qualify endpoint (POST request).
• Normalizes incoming fields (name, email, company, message) into a consistent lead record.
• Qualifies the lead with OpenAI by sending lead details plus your ICP description to the OpenAI Chat Completions API, returning:
  • a fit score
  • one-sentence reasoning
  • a personalized outreach opener in JSON
• Records results by appending the lead, score, and reasoning to a Google Sheets tab (expected tab name: "Qualified Leads").
• Sends email only when qualified: if the score is 6 or higher, it emails the lead through Gmail, then returns a JSON success response to the webhook caller.

Use cases

• SaaS teams that want to automatically triage demo requests and respond only to the best-fit prospects.
• Automation engineers building lead scoring + outreach pipelines directly inside n8n.
• Founders who want Google Sheets lead tracking without manual qualification spreadsheets.

Technical details

• n8n nodes: webhook, if, set, code, http request, gmail.
• OpenAI integration: HTTP Request to OpenAI Chat Completions API using an ICP description (replace YOUR_ICP_DESCRIPTION_HERE).
• Google Sheets: OAuth2 connection; append to the "Qualified Leads" tab with columns: Date, Name, Email, Score, Company, Reasoning.
• Gmail: OAuth2 connection; configured subject/body and recipient mapping to send personalized outreach to qualified leads.