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The Cold Email Infrastructure Technical Founders Actually Need

You can't scale cold email on Gmail. Here's the tech stack that actually works for serious operators.

Charles Cormier ·

Why Infrastructure Matters

Sending 10 emails/day? Gmail is fine.

Sending 100+ emails/day? You need real infrastructure.

The Stack

Layer 1: Domains

  • Primary domain: Your main brand (never send cold from here)
  • Sending domains: 5–20 domains for cold outreach
  • Setup: Proper DNS, SPF, DKIM, DMARC

Layer 2: Email Sending Platform

We use a combination of:

  • Instantly.ai for sequences
  • Smartlead for deliverability
  • Custom scripts for personalization

Layer 3: Deliverability Monitoring

  • Inbox placement tests
  • Spam score checks
  • Domain reputation tracking
  • Bounce rate monitoring

Layer 4: Data & Targeting

  • Apollo for enrichment
  • Clay for workflows
  • Custom scrapers for niche targeting

Layer 5: CRM & Tracking

  • Linear for ops tracking
  • Custom dashboards for metrics
  • Integration with your CRM

Common Mistakes

  1. Sending from main domain: Instant reputation damage
  2. No warmup period: New domains go to spam
  3. Over-sending: 50+ emails/day/domain = spam folder
  4. No tracking: Can't optimize what you can't measure

Investment Required

  • Time: 2–4 weeks to set up properly
  • Cost: $500–2000/month for tools
  • Expertise: Technical setup + copywriting + strategy

We handle all of this for you. That's the entire point of our Done-For-You package.

FAQ

What is the main lesson from The Cold Email Infrastructure Technical Founders Actually Need?

You can't scale cold email on Gmail. Here's the tech stack that actually works for serious operators.

How should B2B founders apply this?

Use the framework as a starting point, test it against real market feedback, and scale only after the signal is clear.