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MailToaster

Warm up your inbox, land in the inbox

Deliverability
For AI agents
None readiness
About

What is MailToaster

MailToaster automates the email warm-up process by exchanging messages between accounts in a peer-to-peer network, simulating real engagement — opens, replies, and marking emails as important — to build sender reputation gradually. It also rescues emails that land in spam or junk folders and runs DNS checks against SPF, DKIM, and DMARC records to surface configuration issues before they hurt deliverability. It's built for SDRs, BDRs, and founders running outbound campaigns who need new or cold inboxes to reach the primary tab rather than spam. The standout capability is its spam rescue mechanism, which actively pulls flagged emails out of junk folders as part of the warm-up cycle. That said, MailToaster is a single-purpose warm-up tool — it doesn't manage sequences, contact lists, or sending cadences, so you'll need a separate outbound platform alongside it.

Deliverability
Capabilities

Key features

Deliverability infrastructure

warmup, spam tests, and sender reputation

Our verdict

Vanderbuild take

For SDRs, BDRs, and founders spinning up new sending domains, MailToaster does one thing — email warm-up — and does it without requiring manual setup or a large team. UI-only with no API available; you can't drive this from an agent without scraping, which makes it a poor fit if you're building any kind of automated deliverability pipeline or agentic outbound stack. At $29 per inbox per month with a 7-day free trial and no credit card required, the risk to test is essentially zero. The honest limitation is scope: once your inbox is warm, MailToaster has no role in your outbound workflow — you'll need a separate sequencing tool, and costs stack up quickly if you're warming dozens of inboxes simultaneously.

Mateusz Sekta
Founder, vanderbuild
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Our Resources

The wedge

Agentic stack profile

API
Not public

No public programmatic access.

No public API. Not usable from an agent without scraping.

Agentic readiness
None

Not usable from an agent without scraping.

No public API. UI-only. Not usable from an agent without scraping, which we don't recommend.

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

MailToaster alternatives

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

MailToaster(this tool)
Pricing
Seat-based
Budget
$
Best for
SDR / BDR, Founder
Readiness
None
API
No
Mailforge
Pricing
Usage-based
Budget
$
Best for
Founder, GTM Engineer
Readiness
Capable
MCP
No
API
REST
Infraforge
Pricing
Usage-based
Budget
$
Best for
SDR / BDR, Agency
Readiness
Limited
API
REST
Answers

Frequently asked questions

Does MailToaster have a public API?

No — there's no publicly documented API as of today. MailToaster is operated through its UI.

How much does MailToaster cost?

MailToaster: pricing is seat-based, expect entry tier ($) spend. Full pricing page: https://mailtoaster.ai/pricing.

Who is MailToaster best for?

MailToaster is built for SDR / BDR, Founder. Fits Solo, SMB (1-50)-sized teams.