If you want to send 1 million cold emails a month, here's what you need.
Updated: October 2026. ColdSend pricing is now a single plan: $99/mo to start with 1 domain, each extra domain $30/mo (adds 100 mailboxes and 25,000 monthly sends, up to 20 domains). The math below uses the 4-domain setup: ~$189/mo, ~400 mailboxes, ~100K sends.
Quick Maths
What the ColdSend plan includes:
- Starts at $99/month with 1 domain, 100 mailboxes, 25,000 sends
- Add up to 20 domains at $30/month each — every domain adds 100 mailboxes and 25,000 monthly sends (4 domains ≈ $189/mo, ~400 mailboxes, ~100K sends)
- Pre-warmed IPs (no IP warmup needed)
To hit 1 million emails via ACS alone:
- ~$189/month: 4 domains, ~400 mailboxes, ~100K sends
- Scale past 100K by layering imported inboxes (Gmail/Outlook) — capacity conversations happen on a call
Option 1: All ACS Pre-Warmed IP Track
What you need:
- Extended ACS infrastructure beyond the domains on your plan
- A capacity call — 1M all-ACS is a custom build
How it works:
- Every domain stays on ACS permanently
- All inboxes use pre-warmed Azure IPs
- No external inboxes needed
The catch: Scaling ACS capacity into the millions requires a custom build with us — deliberately. Automation quality and IP health matter more than raw capacity, so we size it on a call together, and we recommend using different billing details just to be safe.
Best for: Short-term blasts, proof of concept, or if you want all your volume on pre-warmed IPs.
Option 2: The Rotation Strategy (Recommended)
What you need:
- 4 domains on ACS at any given time ($99 base + 3 extra domains ≈ $189/mo on the plan)
- External inboxes (Google Workspace, Outlook, SMTP) for the rest
- The ColdSend plan (4 domains, ~400 mailboxes, ~100K sends)
How it works:
- Month 1-2: Run campaigns on ACS domains (5–30 emails/day per inbox, building reputation)
- Month 2-3: Domains reach "Medium" or "High" reputation in Google Postmaster
- Month 3: Move those warmed domains to Google Workspace/Outlook
- Put fresh domains on ACS, repeat cycle
Why this works:
- ACS becomes your reputation accelerator, not your permanent infrastructure
- Once domains have reputation, they perform fine on standard infrastructure
- You scale indefinitely without adding more Azure accounts
Best for: Agencies, ongoing high-volume operations, sanity.
Read the full rotation playbook: Cold Email Without Warmup: The Complete 2026 Strategy
How We Differ from Instantly, Smartlead, etc.
Infrastructure, not features.
ColdSend is built on Azure Communication Services (ACS). ACS is a transactional email API—same infrastructure that sends your password resets and shipping notifications. These are pre-warmed, enterprise-grade IP pools reserved for critical mail.
The difference:
- ACS is one-way by design (send-only, no replies)
- We made it two-way by building a reply handling infrastructure on top
- We added guardrails (campaign auto-pauses at 4% bounce rate) so you don't violate ACS terms and get restricted
Most sequencers just connect to Gmail/Outlook APIs and hope your warmup works. We started with enterprise infrastructure and built sequencing on top.
What You'll Actually Pay
Complete No-Warmup Track:
| Item | Cost |
|---|---|
| ColdSend plan (4 domains — ~400 mailboxes, ~100K sends) | $189/mo |
| Extended ACS capacity for 1M/mo | custom quote |
| Total | $189/mo + capacity add-on |
Rotation Strategy:
| Item | Cost |
|---|---|
| ColdSend plan (4 domains on ACS at a time — ~400 mailboxes, ~100K sends) | $189/mo |
| External inboxes (Google/Outlook) | ~$6-12/mo per inbox |
| Total | $189/mo + inbox costs |
For rotation, external inboxes vary by provider. Google Workspace is ~$6-12/user depending on your plan. If you're rotating 40+ domains through a cycle, you'll need to factor inbox costs during the migration phases. Also, given the limits on Google/Outlook inboxes, you'll need a lot more domains here. Assuming 25 inboxes per domain with 25 emails sent per day per inbox, you'll need approximately 54 domains to hit the same volume. And these are generous figures. We recommend at least 100 domains and lower sending volume. Mix and match as per comfort level, we don't have concrete numbers here. You can also spread the sending load across imported inboxes and additional domains (up to 20 at $30/month each). Book a call with us if you wanna do a deep-dive.
The Reality Check
No one has sent 1 million emails through our ACS infrastructure yet. Individually, that is. Collectively, we have.
We'll be honest: at this volume, we need to work closely with you. The guardrails exist, but 1M emails/month puts you in territory where:
- List quality matters more than infrastructure
- Small bounce rate changes have big impacts
- Provider relationships matter
If you're serious about this volume, join our Discord first. We'll review your use case, your list sources, and your campaign approach before you commit.
What we don't have yet:
- CRM integrations (on roadmap; we can build one with you after reviewing your case)
- Done-for-you copywriting (but we can refer you to vetted writers in our community; we have a lot of talent there)
Quick Summary
| Goal | Method | Cost | Complexity |
|---|---|---|---|
| 1M emails, all ACS | custom capacity build | starts at $99/mo + capacity | High |
| 1M emails, rotation | ColdSend plan + external inboxes | $189/mo + inboxes | Higher |
The rotation strategy is more work upfront but significantly more sustainable. The all-ACS track works if you need pre-warmed IPs across all volume and want everything on managed infrastructure.
Try the buying guide → | Join Discord to discuss high-volume setup →
Jul 19, 2026
6 min read
