Overview — What Each Platform Does
ColdRelay
ColdRelay provides dedicated cold email infrastructure — Microsoft 365 mailboxes on isolated Azure tenants with dedicated IPs. Pricing is per-mailbox: $1 (1-199), $0.85 (200-999), $0.70 (1K-4,999), $0.55 (5K+). Features include 100-150 mailboxes per domain, automated DNS, no warmup wait, and a 99% inbox guarantee. Setup takes 2-4 hours with a minimum of 50 mailboxes.
ScaledMail
ScaledMail positions itself as both a cold email infrastructure and outreach automation platform. It combines mailbox provisioning with campaign management features. Plans are tiered by outreach volume: Solopreneur at $79/month (contact ~2,000 prospects/month), Business at $119/month (~10,000 prospects), and Enterprise at $249/month (~30,000 prospects). ScaledMail offers automated inbox creation, domain purchasing, CSV export of ready-to-use accounts, and claims 5x cheaper pricing with 50x faster setup compared to traditional methods.
Feature Comparison
| Feature | ColdRelay | ScaledMail |
|---|---|---|
| Pricing Model | Per-mailbox: $1-$0.55/mailbox/month — pay for exactly the infrastructure you need | Tiered plans: $79-$249/month based on outreach volume, not mailbox count |
| Infrastructure Isolation | ✓ Fully isolated Azure tenants with dedicated IPs — your reputation is yours alone | Infrastructure details less transparent — focus is on the outreach platform rather than infrastructure specifics |
| Mailbox Provisioning | 100-150 mailboxes per domain with automated setup | Create 50 to 1,000 mailboxes in 60 seconds with instant CSV export |
| DNS Configuration | Fully automated SPF, DKIM, DMARC | Automated DNS configuration included |
| Campaign Management | Infrastructure only — pairs with Instantly, Smartlead, etc. for campaign management | ✓ Built-in outreach platform with campaign management features |
| Deliverability Guarantee | 99% inbox placement guarantee with money-back promise | 'Get more replies or you don't pay' guarantee |
| Setup Speed | 2-4 hours for complete infrastructure deployment | Mailboxes created in 60 seconds (provisioning), but domain and DNS setup time varies |
| Warmup | ✓ No warmup required — send from day 1 | Warmup approach not detailed — platform focuses on inbox creation speed |
| Flexibility | ✓ Start with 50 mailboxes, scale to 5,000+ with volume pricing | Locked into plan tiers — need to upgrade plans as volume grows |
| Domain Management | Bring your own domains or purchase through ColdRelay | Buy or add domains directly inside the platform |
| Free Trial | No free trial — but 99% guarantee provides risk coverage | ✓ 7-day free trial on all plans |
| All-in-One vs. Best-of-Breed | Best-of-breed infrastructure — pairs with your preferred sending platform | All-in-one platform combining infrastructure with outreach features |
Where ColdRelay Wins
ColdRelay's per-mailbox pricing gives you precise cost control — you pay for infrastructure, not outreach volume tiers. The dedicated, isolated Azure tenants with dedicated IPs provide a level of infrastructure transparency and quality that ScaledMail doesn't detail. ColdRelay's 99% inbox placement guarantee is specific and measurable, backed by a money-back promise. For teams that already use a sending platform (Instantly, Smartlead, etc.), ColdRelay's infrastructure-only approach means you're not paying for campaign features you won't use. At scale, ColdRelay's volume pricing ($0.55/mailbox at 5K+) can be significantly cheaper than ScaledMail's tier-based model.
Where ScaledMail Wins
ScaledMail's biggest advantage is the all-in-one approach. If you want mailbox provisioning and campaign management in a single platform, ScaledMail removes the need to integrate separate tools. The 7-day free trial lets you test before committing — something ColdRelay doesn't offer. For solopreneurs and small teams just getting started with cold email, ScaledMail's $79/month plan includes everything you need to start reaching prospects. The instant 60-second mailbox creation is genuinely fast for small-batch operations.
✓ Choose ColdRelay If…
Choose ColdRelay if you want dedicated, isolated infrastructure with transparent per-mailbox pricing and you already have (or plan to use) a separate sending platform. ColdRelay is ideal for agencies and larger operations that need infrastructure they can trust at scale — with clear isolation guarantees and volume pricing that gets cheaper as you grow.
Choose ScaledMail If…
Choose ScaledMail if you want an all-in-one platform that handles both infrastructure and campaign management. It's especially appealing for solopreneurs and small teams who prefer a single tool over integrating multiple services. The free trial makes it low-risk to evaluate.
The Verdict
ColdRelay and ScaledMail take different approaches: ColdRelay is pure infrastructure with guaranteed isolation and per-mailbox pricing, while ScaledMail is an all-in-one platform bundling infrastructure with outreach tools. For serious cold email operations that need infrastructure transparency and scale, ColdRelay is the stronger choice. For individuals wanting a simple, all-in-one starting point, ScaledMail's bundled approach has appeal.
Frequently Asked Questions
Is ScaledMail cheaper than ColdRelay?
It depends on volume. ScaledMail's $79/month Solopreneur plan may include enough for small operations. But as you scale, ColdRelay's per-mailbox pricing ($0.70 at 1K+ mailboxes) gives more granular cost control and potentially lower costs at higher volumes.
Do I need a separate sending tool with ColdRelay?
Yes. ColdRelay provides email infrastructure (mailboxes, domains, DNS). You'll pair it with a sending platform like Instantly or Smartlead for campaign management. ScaledMail bundles some outreach features into its plans.
Does ScaledMail offer dedicated IPs?
ScaledMail doesn't prominently detail its infrastructure isolation approach. ColdRelay explicitly provides dedicated IPs and isolated Azure tenants for every deployment.
Can I try ColdRelay before buying?
ColdRelay doesn't offer a free trial, but the 99% inbox placement guarantee with a money-back promise means you're protected if the infrastructure doesn't perform. ScaledMail offers a 7-day free trial.
Which is better for an agency managing multiple clients?
ColdRelay's per-mailbox volume pricing and infrastructure isolation make it well-suited for agencies managing many clients. Each client can have isolated infrastructure. ScaledMail's plan-based pricing may require multiple subscriptions for separate client management.