Email warm-up, embedded.
TrulyInbox Network is the deliverability layer behind cold outreach platforms, ESPs, AI SDRs, AI agents, and agencies that need warm-up embedded, not bolted on. Don't build it. Embed it.
curl -X POST https://lupus-edge.trulyinbox.com/v1/email-accounts \ -H "X-Api-Key: $API_KEY" \ -H "Content-Type: application/json" \ -d '{ "fromEmail": "alex@yourdomain.com", "fromName": "Alex", "type": "gmail" }'
{ "emailAccountId": 9842, "status": "active" } # Account connected. Warm-up starts automatically.
40,000+
Real inboxes warming on day one. A network this size cannot be built overnight, and it's the single biggest factor in warm-up quality.
ESP Coverage
95%+
Average deliverability across the network.
Why teams stop building warm-up in-house
The honest math behind buy-vs-build for outbound infrastructure. We've seen these numbers from teams that started one path and switched.
One Network. Two ways to use it.
Whether you're an agency managing hundreds of client inboxes or a SaaS product embedding warm-up, we have you covered.
Manage hundreds of client inboxes without clicking through a dashboard.
Programmatic management, push deliverability scores into client reports, bulk pause and resume, webhook integration.
“Adding 200 client inboxes used to take a full day. Now it's a script that runs in minutes.”
Bulk inbox management
Connect, pause, and resume hundreds of inboxes with a single API call.
Real-time webhook events
Score changes, recovery alerts, and daily summaries delivered instantly.
Client-ready reporting
Push deliverability scores directly into your client dashboards.
Everything you'd build, already built
A complete warm-up stack exposed through clean REST endpoints and webhooks.
40,000+ real inbox network
The single biggest factor in warm-up quality. A network this size of real, engaged inboxes cannot be built overnight, and we keep growing it every week.
Inbox lifecycle
Connect, configure, pause, resume, and remove inboxes across Google, Microsoft, Yahoo, Zoho, and more.
Reputation scoring
Live deliverability scores updated continuously. ESP-by-ESP breakdowns. 90-day historical data.
Webhook events
Real-time events for status changes, score thresholds, recovery alerts, and daily summaries.
White-label UI
Embed warm-up scores as iframe widgets, or build custom UI on our data API. Your brand, our network.
Battle-tested at scale
7+ years of warm-up tuning, millions of warm-up emails sent monthly, and a network that's still growing every week.
A real network, built over years. Not a feature built last quarter.
Most warm-up APIs are wrappers around a few hundred test inboxes spun up last quarter. TrulyInbox Network runs a real, engaged network of 40,000+ inboxes that's been growing for years. That's the difference you can't fake.
40K+
Real inboxes warming on the network
95%+
Average deliverability across the network
99.9%
Platform uptime, last 12 months
7+ yrs
Of warm-up tuning at production scale
The cost of waiting compounds
Every quarter without embedded warm-up has a real price. Here's what we've seen across teams that delayed.
~12% annual churn
From customers blaming your product for poor deliverability when warm-up isn't built in.
9 to 18 months
To build a warm-up network in-house, with 3 to 5 dedicated engineers and ongoing support overhead.
Every quarter
A competitor in your category embeds warm-up first and starts owning the deliverability narrative your customers care about.
The earlier you embed, the cheaper the math gets.
Built for outbound at agency scale
From lead-gen shops running 50 inboxes to enterprise agencies with 1,000+. Here's what teams say after switching.
“Adding 200 client inboxes used to take a full day. Now it's a script that runs in minutes, and the deliverability reports drop straight into our client decks.”
“We automated client onboarding into a Slack workflow. Clients now go live the same day they sign.”
“Migrated 320 client inboxes over a weekend with zero downtime. Our customers don't even know we use TrulyInbox. That's the whole point.”
Questions teams ask before signing
When plans aren't enough, we build a contract
API access is included in every TrulyInbox plan. The options below are for teams that need embed, white-label, custom SLAs, or contract-grade volume.
Just need API access for your own inboxes? Every TrulyInbox plan includes it. From $22/month.
See plansNetwork
For cold outreach platforms, ESPs, AI SDRs, and AI agents embedding warm-up into their stack.
Custom
Volume-based, contract-driven
- Everything in standard plans
- White-label & co-brand
- Iframe widgets + custom UI APIs
- Higher rate limits & contract volume
- Dedicated solutions engineer
- 99.95% uptime SLA
Enterprise
For ESPs and large platforms with custom infrastructure and compliance needs.
Let's talk
Built around your stack
- Everything in Network
- Dedicated IP pools
- Data residency (US, EU, custom)
- 99.99% uptime SLA
- Custom DPA & security review
- Named CSM + 24/7 support
Ready to embed warm-up?
A 20-minute call gets you sandbox access, a usage estimate, and a contract draft if it's a fit. We'll match your timeline.