Automate Lead Responses with AI: Gmail & Slack Integration

Transform your lead response game with this intelligent n8n workflow that automatically replies to inbound leads in under 60 seconds using AI-powered classification and Gmail automation. Never miss a hot lead again, even when you're away from your desk.

What this workflow does

This powerful automation captures contact form submissions via webhook and uses an LLM to intelligently classify each lead as hot lead, cold lead, support request, spam, or partnership opportunity. For high-value prospects, it automatically drafts personalized 3-sentence replies, sends them through Gmail, and alerts your team via Slack. Low-priority submissions like spam and support requests are acknowledged without triggering unnecessary responses, keeping your communication focused and professional.

• Webhook receives and normalizes lead data with sample-data fallback for instant testing
• AI classification assigns urgency scores and categories to each submission
• Safe JSON parsing prevents workflow failures from malformed responses
• Selective response system only engages hot leads and partnerships
• Guaranteed 200 status acknowledgment for reliable webhook integration

Use cases

Perfect for SaaS companies, agencies, and consultants who need immediate lead engagement without manual monitoring. Ideal for businesses receiving leads across time zones, ensuring prospects get instant responses regardless of your schedule. Sales teams can focus on qualified conversations while the workflow handles initial contact and filtering automatically.

Technical details

Built using n8n's webhook, switch, Gmail, set, code, and sticky note nodes. Integrates with OpenRouter API (defaulting to Gemini 2.5 Flash) for AI classification, Gmail OAuth2 for email sending, and Slack webhooks for team notifications. Setup requires OpenRouter API key, Gmail OAuth2 connection, and Slack webhook URL configuration.

Extremely cost-effective at roughly $0.0002 per lead classification and $0.0004 for hot leads with drafted replies using Gemini 2.5 Flash. Complete setup takes 10-15 minutes with full documentation and open-source code available on GitHub.