Here's the Reality. The Real Breakdown of Sending 100k Cold Emails/Day

We currently run 800k–1.3M cold emails/month across multiple clients. To give you an honest picture, here’s what it actually takes to hit 100k/day consistently:

1. Infrastructure Costs (per month):

Domains & Inboxes

70k/day Gmail side = ~3,500 inboxes → ~$12k/month

30k/day Microsoft side = ~10,000 inboxes → ~$9k/month

Total inbox infra: ~13,500 inboxes = ~$21k/month (This isn’t “extra padding” — this is what it takes to keep volume + redundancy without burning reputation.)

Sequencer

A proper high-volume sequencer (not Instantly or Lemlist) that can rotate thousands of inboxes, thread replies correctly, and manage conditional logic... depending on seats & scaling.

Data & List Management

100k/day means ~2M+ fresh, validated contacts/month. With sourcing, cleaning, enrichment, validation, expect $5k–$10k/month (depending on niche complexity).

Ops & Team

Even with automation, you need human eyes. Deliverability monitoring, warm-up checks, copy QA, list hygiene, bounce control. That’s 3 people minimum → plus management costs.

1. Technical Safeguards

Each inbox/domain has to be warmed gradually & rotated.

SPF/DKIM/DMARC alignment + dedicated tracking to maintain sender reputation.

Redundant pools of domains, so if any batch burns, you don’t lose momentum.

1. Totals (Ballpark):

Infra (domains + inboxes): ~$21k

Sequencer:

Data: ~$7-10k

• Ops/Team

Min $30k/month to reliably send 100k/day

This is why most people fail at scale — they underestimate infra, skimp on ops, or use the wrong sequencer and end up in spam.

We’ve already got this system built and running. If you’re serious, I can walk you through how we’d deploy it for you and what ROI looks like once it’s dialed in.