Overview — What Each Platform Does
ColdRelay
ColdRelay provisions Microsoft 365 mailboxes on isolated Azure tenants with dedicated IPs — automated, self-serve, per-mailbox pricing: $1 (1-199), $0.85 (200-999), $0.70 (1K-4,999), $0.55 (5K+). Each mailbox sends 2 outbound + 2 warmup = 4 emails/day. Infrastructure is live in 60 minutes, with a 95% inbox guarantee, 14-day money-back, and a 50-mailbox minimum.
ScaledMail
ScaledMail is a managed, done-for-you cold-email infrastructure service. Their team configures domains, DNS, and inboxes on your behalf and supports each account through a dedicated Slack channel. Pricing splits by infrastructure type: Google Workspace at $3.50/mailbox/month (2-3 mailboxes/domain, up to 25 emails/day), Microsoft Outlook at $50/domain/month (25 mailboxes/domain, up to 10 emails/day each — ~$2/mailbox), and SMTP at $3.75/domain/month (4 mailboxes/domain, ~$0.94/mailbox). Setup runs 2-4 business days. Optional pre-aged, pre-warmed domains are available for immediate sending. The team has operated 200,000+ inboxes.
Feature Comparison
| Feature | ColdRelay | ScaledMail |
|---|---|---|
| Delivery Model | Self-serve, automated provisioning — you control the dashboard | Managed done-for-you — ScaledMail's operators configure everything for you |
| Setup Speed | ✓ 60 minutes — automated end-to-end | 2-4 business days — human operators configuring per order |
| Infrastructure Options | Microsoft 365 only — on isolated Azure tenants with dedicated IPs | ✓ Three blended options: Google Workspace, Microsoft Outlook, or SMTP |
| Pricing at 50 Mailboxes | ✓ $50/mo (50 × $1.00) | ~$175/mo on Google ($3.50 × 50) or ~$100/mo on Outlook (2 domains × $50) |
| Pricing at 200 Mailboxes | ✓ $170/mo (200 × $0.85) | ~$700/mo on Google or ~$400/mo on Outlook (8 domains × $50) |
| Pricing at 1,000+ Mailboxes | ✓ $700/mo (1,000 × $0.70), drops to $0.55 at 5K | ~$2,000/mo on Outlook (40 domains × $50) — managed pricing doesn't scale down with volume |
| Daily Sending per Mailbox | 2 outbound + 2 warmup = 4/day | ✓ 25/day on Google, 10/day on Outlook and SMTP |
| Deliverability Guarantee | ✓ 95% inbox placement + 14-day money-back | No formal money-back guarantee — Slack-channel support and deliverability monitoring instead |
| Pre-Warmed Domains | Not offered — automated DNS setup, send conservatively from day one | ✓ Pre-aged and pre-warmed domains available as an upsell — useful if you need to skip warmup |
| Customer Support Model | Standard support — dashboard, docs, ticketing | ✓ Dedicated Slack channel with cold-email operators from day one |
| Best-Fit Scale | ✓ 50 to 5,000+ mailboxes with volume pricing | Small-to-mid scale where managed handholding matters more than per-mailbox cost |
| Sequencer Integration | Works with Instantly, Smartlead, and other major platforms | 12+ listed integrations: Smartlead, Instantly, EmailBison, Apollo, Lemlist, Clay, etc. |
Where ColdRelay Wins
ColdRelay is dramatically cheaper at every volume tier — $50/mo at 50 mailboxes vs ScaledMail's ~$100-175/mo, and $700/mo at 1,000 mailboxes vs ScaledMail's ~$2,000/mo. You also get dedicated IPs on isolated Azure tenants on every plan, where ScaledMail's IP strategy isn't published and varies by infrastructure type. ColdRelay's 95% inbox guarantee with 14-day money-back is a concrete commitment; ScaledMail's deliverability promise is operational (Slack support, monitoring) rather than contractual. Setup runs hours, not business days, because the entire pipeline is automated rather than human-operated.
Where ScaledMail Wins
ScaledMail's managed-service model is the right fit if you genuinely don't want to touch the infrastructure yourself — their operators handle domain registration, DNS, mailbox provisioning, and ongoing tuning, with a dedicated Slack channel for questions. The blended-infrastructure menu (Google, Outlook, SMTP) is useful if you specifically need Google Workspace mailboxes or want to mix providers across a portfolio. Pre-aged, pre-warmed domains are a real differentiator if you need to send aggressively from day one and can't wait through any ramp.
✓ Choose ColdRelay If…
Choose ColdRelay if you want automated, dashboard-driven Microsoft 365 infrastructure on dedicated IPs at the lowest per-mailbox cost in the category. Best for agencies and sales teams comfortable owning their own setup, operations scaling past 200 mailboxes where the price gap becomes a multiple, and anyone who wants a contractual inbox guarantee instead of a Slack channel.
Choose ScaledMail If…
Choose ScaledMail if you want a managed done-for-you service where someone else configures and monitors the infrastructure, with hands-on Slack support included. Also a fit if you specifically need Google Workspace mailboxes, want to blend providers across one portfolio, or need pre-warmed domains ready to send on day one.
The Verdict
ColdRelay and ScaledMail solve the same problem with opposite philosophies: ColdRelay is self-serve, automated, Microsoft-365-only, and 2-4x cheaper per mailbox at every tier; ScaledMail is managed, human-operated, supports three infrastructure types, and bundles white-glove Slack support. If you want the cheapest path to dedicated-IP Microsoft 365 mailboxes and can run it yourself, choose ColdRelay.
Frequently Asked Questions
Is ScaledMail self-serve or managed?
Managed. ScaledMail's team configures domains, DNS, and inboxes on your behalf and supports each account through a dedicated Slack channel. ColdRelay is self-serve with automated provisioning — infrastructure is live in 60 minutes rather than 2-4 business days.
Which is cheaper at 200 mailboxes?
ColdRelay: 200 × $0.85 = $170/mo. ScaledMail (Outlook plan): 8 domains × $50 = $400/mo at 25 mailboxes/domain. ScaledMail (Google plan): 200 × $3.50 = $700/mo. ColdRelay is 2-4x cheaper at this volume.
Does ScaledMail offer Microsoft 365 mailboxes like ColdRelay?
ScaledMail offers Microsoft Outlook mailboxes at $50/domain/month (25 mailboxes/domain, 10 sends/day each). ColdRelay's Microsoft 365 mailboxes sit on isolated Azure tenants with dedicated IPs and per-mailbox pricing from $1.00 down to $0.55.
What about pre-warmed domains?
ScaledMail sells pre-aged, pre-warmed domains as an upsell for accounts that need to send aggressively from day one. ColdRelay doesn't offer pre-warmed domains — the platform expects conservative sending (4/day per mailbox) from launch with warmup built into the daily cap.
Can I get a money-back guarantee with ScaledMail?
ScaledMail doesn't publish a formal money-back guarantee — support is delivered through a dedicated Slack channel and ongoing deliverability monitoring. ColdRelay offers a 14-day money-back guarantee backed by a 95% inbox placement promise.