The infrastructure layer for high-velocity sales teams. We manage the IP rotation, DKIM signatures, and warm-up cycles so you can focus on the copy.
Google and Outlook now use AI-driven sentiment analysis and domain reputation scoring. If you send 100 emails from a new domain today, 98 of them will be burned by tomorrow.
"Coldbox abstracts the technical complexity. It's not just a sender; it's a reputation management engine."
We route traffic through residential IPs near your target audience to maximize trust scores.
Don't waste time clicking buttons. Integrate Coldbox directly into your SaaS or internal tools via our REST API.
curl -X POST https://api.coldbox.io/v1/campaigns \ -H "Authorization: Bearer sk_live_51..." \ -d '{ "name": "Q4_Outreach", "config": { "daily_limit": 150, "auto_warm": true, "stop_on_reply": true }, "audience": ["lead_8921", "lead_8922"] }'
| FEATURE | LEGACY ESPs | COLDBOX |
|---|---|---|
| IP Rotation | Shared Dirty Pool | Dynamic Residential |
| Warm-up Network | Synthetic (Fake) | Peer-to-Peer (Real) |
| HTML Obfuscation | None | Polymorphic Injection |
| Limit Handling | Hard Stop (429 Error) | Auto-Failover Node |
Built for scale, security, and deliverability.
Don't rely on one email address. Coldbox automatically distributes volume. If one account disconnects, the system reroutes traffic instantly.
We rewrite email bodies automatically to ensure no two emails have the exact same hash signature.
Real-time SMTP verification before sending.
Reply to leads from 50 different inboxes in one UI.
We process millions of data points. Security is the foundation.
Added support for Outlook GraphQL API to bypass SMTP limits entirely.
Introduced industry-specific warming pools (B2B vs B2C).
Pay for the volume you send, not the seats you fill.
For solo founders validating an offer.
For sales teams scaling outreach.
White-label infrastructure.
Join 4,000+ engineers scaling their outreach on Coldbox.
SOC2 Compliant • GDPR Ready • 99.9% Uptime