If you're evaluating CheapInboxes alongside other cold email infrastructure, the decision comes down to which provider keeps your inboxes landing as you scale. Here's what ScaledMail offers and where it fits.
We manage 230,000+ inboxes across 1,600+ subscribers, all built around one priority: inbox placement that holds up under cold email volume.
What ScaledMail Is Built For
- Deliverability that holds at scale. Cold email infrastructure earns its keep when your inboxes still land at 50, 100, 500 inboxes. ScaledMail's infrastructure runs multi-ESP with isolated tenants and pre-aged domains, all built around that priority.
- Managed setup and ongoing monitoring. We handle DNS, IP rotation, domain rotation, and reputation monitoring. Most teams don't have a deliverability engineer in-house. ScaledMail is that engineer.
- Pre-aged domains for fast deployment. 30, 90, or 180-day pre-aged domains let agencies and operators launch new clients without the 2-4 week warmup wait.
- Domain quality you can verify. Cold email performs best on .com (preferred), or .co/.io/.ai as second tier. ScaledMail sources these tiers exclusively, no .xyz, .club, or .store TLDs that ESPs treat aggressively.
- Isolated tenants. Every M365 and Google Workspace tenant we provision is isolated to your account. Your sender reputation within those ESPs reflects your own sending behavior, nothing else.
- Human support on Slack. Dedicated Slack, web chat, in-app chat, all routed to humans on US hours. When inbox placement moves, you want someone reading your logs in minutes.
The Real Math: Inbox Price vs. Effective Pipeline
Here's the math the per-inbox price doesn't show.
Say you're running 50 inboxes sending 15 cold emails each per day. That's 750 cold emails per day, roughly 16,500 per month.
At a healthy 3% reply rate, realistic given our benchmark range of 1.5-4%, that's 495 replies per month. Of those, around 25% come back positive (we see 10-30% across campaigns), so about 124 real conversations. At a $500 average deal close, that's $62,000 in monthly pipeline.
Now say a deliverability problem costs you 20% of inbox placement. Could be warmup gaps, copy fingerprinting, sender-reputation drift, or tenant configuration. They all show up the same way at the bottom line. Your effective send drops from 16,500 to 13,200. Reply rate drops proportionally. You're now looking at ~99 positive replies instead of 124. That's 25 lost opportunities per month. $12,500 in lost pipeline.
Whatever you save on per-inbox cost, weigh it against that math.
Infrastructure cost should be measured against campaign performance, not per-inbox price.
ScaledMail: Optimized for Deliverability, more than Price
Multi-ESP Diversification
Since 2024, ScaledMail has run Microsoft 365 alongside Google Workspace on isolated tenants. That operating history shows up in how we handle M365's filter logic, which shifts harder than Google's under cold email volume. When one ESP tightens filters, the others keep delivering. We see ESP-level shifts constantly across 230,000+ inboxes.
Isolated Tenant Infrastructure
Your M365 and Google Workspace tenants are isolated from other customers. Your sender reputation within those ESPs reflects your own sending behavior, and every inbox and domain on your account stays on your account. We chose isolated tenancy because reputation control is the part of deliverability we can actually guarantee.
Pre-Aged Domains
30, 90, or 180-day pre-aged domains that are already trusted by ESPs. Skip the warmup wait entirely. One agency went from signed contract to live campaigns in 48 hours. Pre-aged domains are a competitive advantage when every week of warmup is a week of lost revenue.
Expert-Managed Infrastructure
Dedicated Slack + web chat + in-app chat, all routed to humans. Monitoring that catches deliverability issues before they hit your campaigns. We recommend a 2:1 warmup ratio on every inbox, permanently. That's 2 warmup emails for every 1 cold email, run through your warmup tool of choice. ScaledMail is compatible with all warmup tools (Instantly warmup, Smartlead warmup, Mailwarm, TrulyInbox, and others). Warmup runs in your sequencer. ScaledMail handles the infrastructure side, and we guide you on the right ratio and tools at setup.
Inside the ScaledMail Package
| Capability | What's included |
|---|---|
| Inbox types | Google Workspace, Microsoft 365, SMTP |
| Tenant model | Isolated M365 and Google tenants per account |
| ESP operating history | Microsoft 365 since 2024, Google Workspace from launch |
| Pre-aged domains | 30, 90, or 180-day options available |
| Warmup integration | Compatible with Instantly, Smartlead, EmailBison, PlusVibe, Mailwarm, TrulyInbox |
| DNS configuration | SPF, DKIM, DMARC set up by our team |
| Deliverability monitoring | Expert monitoring + Slack alerts |
| Support | Dedicated Slack + web chat + in-app, US-based humans |
| Domain rotation | Managed 2-batch rotation system |
| Pricing | Per-inbox with volume discounts at $1K/mo and $5K/mo |
| Billing | Month-to-month, no annual lock-in |
How to Tell If Your Infrastructure Is the Problem
Infrastructure issues show up in two distinct patterns, and knowing which one you're dealing with saves weeks of troubleshooting.
- If reply rate drops 90% overnight, you've hit copy fingerprinting. ESPs detected identical content across too many sends. The fix is completely different copy, more than subject line tweaks.
- If reply rate declines gradually over weeks, that's domain or infrastructure burn. The fix is swapping to rested domains. On managed infrastructure, this happens through automated rotation. On self-managed setups, it's a manual workflow you have to stay on top of.
If you're seeing the gradual decline and managing the rotation yourself, that's often the signal to move to managed infrastructure.
When ScaledMail Is the Right Choice
CheapInboxes is a solid provider in the cold email infrastructure space. ScaledMail is the right choice when:
- You're an agency onboarding clients with tight launch timelines and can't wait out warmup
- Deliverability swings directly hit revenue and you need active monitoring
- You don't have a deliverability engineer in-house and want managed setup
- You want multi-ESP diversification to protect against single-ESP filter shifts
- You need pre-aged domains for same-week deployment
- You want US-based human support on Slack when something moves
Making the Switch
- Infrastructure assessment. We review your current sending setup and volume needs.
- Multi-ESP provisioning. Google Workspace + Microsoft 365 on isolated infrastructure.
- DNS configured. SPF, DKIM, DMARC set up by our team.
- Fast deployment. Pre-aged domains for same-week launch, or 14-day warmup for fresh.
- Ongoing management. Dedicated Slack, active monitoring, domain rotation handled.
Frequently Asked Questions
Is CheapInboxes good for cold email?
CheapInboxes is a solid cold email infrastructure provider. ScaledMail fits when you need managed setup, ESP diversification, pre-aged domains, or US-based human support, the things that matter most when deliverability drives revenue.
How much do cheap cold email inboxes cost?
Budget providers typically range from $1-3 per inbox per month. ScaledMail's per-inbox pricing is higher and includes DNS management, IP rotation, deliverability monitoring with Slack alerts, isolated tenants, and dedicated Slack support. Warmup runs in your sequencer, and ScaledMail is compatible with all major warmup tools. We recommend the 2:1 ratio and guide you on tool selection at setup.
When should I move from a budget provider to managed infrastructure?
When infrastructure management starts consuming meaningful hours of your week, when you've experienced unexplained deliverability drops, when you're an agency onboarding clients with tight timelines, or when the cost of a bad week of deliverability exceeds your monthly per-inbox savings.
Can I migrate from a budget provider to ScaledMail without downtime?
Yes. We provision new inboxes on isolated infrastructure, warm them (or use pre-aged domains for immediate deployment), and you swap them into your sequencer. Run both in parallel during the transition. Most migrations complete in 48-72 hours.
Get Started
Ready for infrastructure built for inbox placement? Book a call to discuss your setup, or build your custom package now.
Month-to-month, no annual lock-in. Infrastructure that performs.