Cold Email Outreach AI Agent
Cold leads to warm meetings: AI-powered sales prospecting
Prospecting system that deeply researches every lead, generates AI-personalized emails, and executes 4-step sequences with automatic follow-up. LSSI Article 21 compliant.
1,852
Leads in database
gestorias across Spain
510
Leads researched
with enriched data
419
Emails sent
4-step sequence
The Challenge
Manual gestoria prospecting is slow and unscalable. Researching each lead, writing personalized emails, and following up consumes hours that should be spent closing deals.
The Approach
4-step pipeline: deep lead research (Google Maps reviews, PageSpeed, SEO, SSL, competitors), AI-personalized email generation, warm-up sequence (10→20→30/day) and webhook tracking (opens/clicks/replies).
Architecture
Lead enrichment from 6 sources: Google Maps, reviews, PageSpeed, SEO analysis, SSL, and competitors
Evaluator-optimizer pipeline: generates email, evaluates quality with Chain-of-Thought, regenerates if below threshold
Progressive warm-up from 10→20→30 emails/day to protect domain reputation
PostgreSQL-based processing queue: prioritizes leads with the most enriched data
GMass webhooks for real-time tracking: opens, clicks, replies feed into analytics
Key Technical Decisions
Claude Sonnet 4.6 for email generation: superior quality justified by direct conversion impact
Evaluator-optimizer pipeline with Chain-of-Thought: quality scoring before sending
Progressive warm-up 10→20→30: protects long-term deliverability
Apify for Google Maps: real review data without direct scraping
LSSI Art. 21 compliance: documented legitimate interest by sector
How It Was Built
Cold prospecting system built on Supabase Edge Functions with pg_cron orchestration. The pipeline researches each lead by querying Google Maps (real reviews via Apify), analyzes their website (PageSpeed, SEO, SSL) and generates personalized emails using Claude Sonnet 4.6 with an evaluator-optimizer pipeline. The 4-step sequence (introduction, value, use case, last chance) executes with 3-5 day spacing. GMass handles delivery with progressive warm-up and tracking webhooks.
Results
From 0 to 1,852 leads and 419 emails sent in the first weeks. The system prioritizes quality over volume: each email is personalized with real data from the prospect business. The 4-step sequence maximizes response opportunities while respecting domain reputation with progressive warm-up.
Tech Stack
What you get
- Deep research on every prospect - reviews, PageSpeed, SEO, SSL, competitors
- Emails that feel handwritten - personalized with real business data
- 4-step sequence with automatic follow-up until you get a response
- Progressive warm-up: 10→20→30 emails/day to protect domain reputation
- LSSI Article 21 compliance - legal and responsible prospecting
- Full webhook tracking: opens, clicks, and replies in real time