HubSpot to Gmail Email Reply in Seconds with Claude + Slack

Reply to new HubSpot leads in seconds—automatically drafted with Claude and sent via Gmail, with Slack + HubSpot logging

This n8n automation workflow listens for newly created HubSpot contacts from form submissions, uses Anthropic Claude to generate a personalized first-response email, sends it through Gmail (including your correct signature), then logs the send on the HubSpot contact timeline and alerts your team in Slack.

What this workflow does

• Triggers on HubSpot contact creation using a webhook subscription for contact.creation.
• Normalizes incoming events and ignores any non-contact-creation events and contacts created via CSV import.
• Pulls the contact’s newest form submission details and continues only if the contact has at least one form submission.
• Extracts lead fields (name, email, company, job title, message, website) and combines them with your predefined business context.
• Calls Claude to generate a JSON reply containing: an email subject, an HTML body, and a one-sentence lead summary.
• Sends via Gmail by retrieving your Gmail “sendAs” settings, appending the correct Gmail signature, and sending the email to the lead.
• Logs engagement in HubSpot on the contact timeline and posts a Slack alert including lead details, the sent subject, and Claude’s summary.

Use cases

• Instant first-contact emails when a website form creates a new HubSpot contact.
• Faster lead response for SaaS sales teams while keeping messages personalized via Claude.
• Team visibility in Slack for every auto-sent HubSpot lead reply (subject + short summary).

Technical details

• HubSpot webhook trigger for contact.creation, with CRM contact read/write scopes in a HubSpot private app.
• Anthropic Claude API to generate a JSON email (subject, HTML body, one-sentence summary) from extracted lead context.
• Gmail node to send from the correct “sendAs” identity and append your signature.
• Slack node to notify your sales channel with lead data and Claude summary.
• Core n8n nodes/logic include if, set, code, and no op, plus gmail and slack.