vanderbuild
Get in touch
← All tools

TrulyInbox

Warmup that earns inbox placement.

Deliverability
For AI agents
APICapable readiness
About

What is TrulyInbox

TrulyInbox warms up email accounts by simulating human-like interactions through a network of real accounts, gradually increasing sending volume and generating AI-powered, industry-specific warmup content across three selectable strategies. It's built for SDRs, BDRs, agencies running cold email programs, and GTM leads managing outbound at SMB or mid-market scale. The standout capability is its AI-generated warmup content — rather than recycling generic filler emails, it produces contextually relevant exchanges that look authentic to spam filters. It also automates SPF, DKIM, and DMARC verification, monitors blacklists in real time, and scores inbox health from a single dashboard across unlimited connected accounts. Where it falls short: it is a warmup and deliverability tool, not a sequencer — teams expecting full outbound campaign management will need a separate sending platform alongside it.

Deliverability
Capabilities

Key features

Deliverability infrastructure

warmup, spam tests, and sender reputation

Native CRM integration

first-party connectors, no middleware required

AI capabilities

AI-drafted personalised copy

Outbound webhooks

event-driven integrations

Our verdict

Vanderbuild take

For SDRs, agencies, and GTM leads who run cold email at any real volume, TrulyInbox is one of the more credible deliverability tools in this tier — it goes beyond basic warmup by automating authentication checks, scoring inbox health, and generating AI content that doesn't look like warmup noise. The REST API is available, which means you can wrap it into your own orchestration layer or MCP setup when you need programmatic account management — it won't drive itself agentically out of the box, but it's wirable. At $22–$79/month with a free tier and no credit card required to start, the cost is accessible for small teams, though you'll likely upgrade as daily email volume and account counts grow. The honest gap here is scope: TrulyInbox handles deliverability and warmup well, but it doesn't replace a sequencing tool — you're buying infrastructure, not a full outbound stack.

Mateusz Sekta
Founder, vanderbuild
Learn more

Our Resources

The wedge

Agentic stack profile

API
REST

Programmatic access available.

REST API — straightforward to call from any agent or workflow tool. Rate limits and auth vary by plan.

API docs →
Agentic readiness
Capable

Solid API access — wraps cleanly for agent use.

Solid REST or SDK access. No MCP server yet, but easy to wrap in custom agent tooling. Most modern SaaS tools land here.

Stack role
Deliverability

Where this tool slots into an agentic pipeline.

Plays the role of Deliverability in an agentic pipeline. Use it to keep email sending reputation healthy — warmup, spam tests.

Compare

TrulyInbox alternatives

Tools that solve a similar problem — compared at a glance.

TrulyInbox(this tool)
Pricing
Freemium
Budget
$$
Best for
SDR / BDR, Agency
Readiness
Capable
API
REST
Zapmail
Pricing
Client-based
Budget
$$
Best for
SDR / BDR, Agency
Readiness
Capable
API
REST
Zerobounce
Pricing
Freemium
Budget
$$
Best for
RevOps, GTM Engineer
Readiness
Capable
API
REST
Answers

Frequently asked questions

Does TrulyInbox have a public API?

Yes — TrulyInbox ships a REST API. Docs: https://developer.trulyinbox.com/.

How much does TrulyInbox cost?

TrulyInbox: pricing is freemium, expect mid tier ($$) spend. Full pricing page: https://www.trulyinbox.com/pricing/.

Who is TrulyInbox best for?

TrulyInbox is built for SDR / BDR, Agency, GTM Lead. Fits SMB (1-50), Mid-market (50-500)-sized teams.

How well does TrulyInbox fit an agentic sales stack?

Tier: Capable. Solid public API, no MCP yet — straightforward to wrap in your own agent tooling.