Overview — What Each Platform Does
ColdRelay
ColdRelay is a cold email infrastructure provider delivering Microsoft 365 mailboxes on isolated Azure tenants with dedicated IPs. Pricing starts at $1/mailbox/month with volume discounts to $0.55 at scale. Features include 100-150 mailboxes per domain, auto DNS configuration (SPF, DKIM, DMARC), no warmup wait, and a 95% inbox placement guarantee. Minimum order is just 50 mailboxes with 60-minute setup.
Superwave
Superwave is a cold email infrastructure provider focused on deliverability — dedicated IPs with dynamic IP rotation, instant mailbox provisioning, automated DNS/auth, and deliverability monitoring, plus Slack-based access to deliverability experts. It supports sending up to 5,000 emails/day per domain without an extended warmup. Pricing is now published: $119/month for up to 50 inboxes (~$2.40/mailbox), including domain provisioning, on annual billing only (no monthly option).
Feature Comparison
| Feature | ColdRelay | Superwave |
|---|---|---|
| Pricing Transparency | ✓ Fully transparent: $1/mailbox (1-199), $0.85 (200-999), $0.70 (1K-4999), $0.55 (5K+) | Published: $119/month for up to 50 inboxes (~$2.40/mailbox), annual billing only |
| Infrastructure Isolation | ✓ Dedicated, isolated Azure tenants with dedicated IPs — guaranteed separation | Managed infrastructure with isolation features — specifics vary by plan |
| DNS Configuration | Fully automated SPF, DKIM, DMARC for all domains | Automated DNS setup with concierge support available |
| Mailbox Providers | Microsoft 365 exclusively — deep expertise in Azure/Exchange | Dedicated IPs with dynamic IP rotation; specific mailbox provider not stated on current site |
| Setup Time | 60 minutes with automated provisioning | Instant mailbox provisioning |
| Warmup | ✓ No warmup required — send from day 1 | Warmup support included with managed onboarding |
| Inbox Guarantee | ✓ 95% inbox placement guarantee with money-back promise | No published inbox guarantee |
| Minimum Order | ✓ 50 mailboxes — low barrier to entry | Varies — contact sales for minimum requirements |
| Deliverability Consulting | Infrastructure focused — deliverability through technical setup | ✓ Slack-based access to deliverability experts |
| Self-Service | Fully self-service ordering and management | Self-serve with published pricing and instant mailboxes |
| Scalability | ✓ Clear volume pricing from 50 to 5,000+ mailboxes | Scalable with custom pricing at higher volumes |
| Mailboxes per Domain | ✓ 100-150 mailboxes per domain for maximum utilization | Domain density varies by configuration |
Where ColdRelay Wins
ColdRelay's biggest advantages over Superwave are lower cost, monthly billing, and per-mailbox granularity. Superwave now publishes pricing ($119/month for up to 50 inboxes, ~$2.40/mailbox) but only on annual billing — ColdRelay's $1/mailbox base is cheaper, bills monthly with no annual lock-in, and scales down to $0.55 at volume. The 95% inbox placement guarantee with a money-back promise gives you quantifiable confidence in the infrastructure. ColdRelay's dedicated Azure tenants with dedicated IPs provide clear, guaranteed isolation. The no-warmup approach means you can start campaigns immediately, and the 60-minute setup is predictable and fast.
Where Superwave Wins
Superwave's deliverability-first approach is genuinely valuable for teams that want IP-level reputation protection and hands-on guidance — dedicated IPs with dynamic rotation, instant mailboxes, deliverability monitoring, and Slack-based access to deliverability experts. Its headroom of up to 5,000 emails/day per domain without an extended warmup suits high-volume senders. If you want expert support optimizing your sending strategy alongside your infrastructure, Superwave's approach has merit.
✓ Choose ColdRelay If…
Choose ColdRelay if you want transparent pricing, guaranteed infrastructure isolation, and the ability to get started immediately without a sales process. ColdRelay is ideal for experienced cold email operators who know what they need and want to move fast — self-service ordering, automated setup, and clear volume pricing.
Choose Superwave If…
Choose Superwave if you value a deliverability-first approach with dynamic IP rotation and Slack-based access to deliverability experts. If you want hands-on guidance optimizing your setup and are comfortable with annual billing, Superwave's approach may be worth it.
The Verdict
ColdRelay and Superwave take different approaches to the same problem. ColdRelay is the self-service, lowest-cost option with guaranteed isolation, monthly billing, and a 95% inbox guarantee. Superwave leans on dedicated IPs with dynamic rotation and hands-on deliverability expertise. Both now publish pricing — ColdRelay is cheaper per mailbox ($1 vs ~$2.40) and bills monthly, while Superwave bills annually only. For experienced operators who want speed, low cost, and no annual lock-in, ColdRelay is the better fit. For teams that want expert-led deliverability support and IP rotation, Superwave's approach has value.
Frequently Asked Questions
How does Superwave's pricing compare to ColdRelay?
Superwave now publishes pricing: $119/month for up to 50 inboxes (~$2.40/mailbox), on annual billing only. ColdRelay is $1/mailbox at the base tier with monthly billing, scaling down to $0.55 at 5,000+ mailboxes — cheaper per mailbox and with no annual commitment.
Does Superwave offer a money-back guarantee?
Superwave doesn't publish a specific inbox placement guarantee. ColdRelay offers a 95% inbox guarantee with a money-back promise.
Can I get Google Workspace mailboxes from ColdRelay?
No. ColdRelay exclusively offers Microsoft 365 on Azure. If you specifically need Google Workspace mailboxes, a multi-provider platform would be a better fit.
Which is better for agencies scaling cold email?
ColdRelay's transparent volume pricing ($0.70 at 1K-4,999 mailboxes, $0.55 at 5K+) makes cost planning straightforward for agencies. Superwave publishes flat pricing (~$119/month per 50 inboxes, annual billing), but ColdRelay's volume tiers scale lower for large agency deployments.
How quickly can I start sending with each platform?
ColdRelay: 60 minutes with no warmup required. Superwave: instant mailbox provisioning, with up to 5,000 emails/day per domain and no extended warmup.