vanderbuild
Get in touch
← All tools

MailerCheck

Emails that actually reach the inbox

Deliverability
For AI agents
APICapable readiness
About

What is MailerCheck

MailerCheck verifies email lists, tests inbox placement predictions, and scans email content for spam triggers — all in one place. It's built for founders, marketers, and SDR/BDR teams at solo operations and SMBs who send bulk campaigns and can't afford high bounce rates eating into their sender reputation. The standout capability is inbox placement testing: you can see how your emails are likely to land across major providers before you hit send, not after. It also catches edge cases like catch-all addresses, disposable emails, and full mailboxes that most basic validators miss. Where it falls short is depth on the sending side — MailerCheck is a verification and diagnostics layer, not an email sending platform, so you'll still need a separate ESP to run campaigns.

Deliverability
Capabilities

Key features

Deliverability infrastructure

warmup, spam tests, and sender reputation

Data

verified emails, real-time enrichment

No-code automation support

works with major iPaaS platforms

Our verdict

Vanderbuild take

For founders and small marketing or SDR teams who are watching bounce rates climb and don't know why, MailerCheck gives you a clear diagnostic layer — list verification, inbox placement testing, and content flagging in one tool without needing to stitch together three separate services. The REST API is live and accessible, so you can wrap MailerCheck into your own automation stack or MCP layer without much friction — solid agentic readiness for a tool in this category, even if native MCP support hasn't been confirmed. Free or near-free to start, with usage-based pricing that stays low-risk until you're running serious volume. The honest limitation: this is purely a verification and diagnostics tool — it doesn't send email, manage sequences, or replace your ESP, so budget for that separately.

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

MailerCheck alternatives

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

MailerCheck(this tool)
Pricing
Usage-based
Budget
$
Best for
Marketing, SDR / BDR
Readiness
Capable
API
REST
Mailforge
Pricing
Usage-based
Budget
$
Best for
Founder, GTM Engineer
Readiness
Capable
MCP
No
API
REST
Warmupinbox
Pricing
Custom
Budget
$$$$
Best for
SDR / BDR, RevOps
Readiness
Capable
API
REST
Answers

Frequently asked questions

Does MailerCheck have a public API?

Yes — MailerCheck ships a REST API. Docs: https://developers.mailercheck.com/.

How much does MailerCheck cost?

MailerCheck: pricing is usage-based, expect entry tier ($) spend. Full pricing page: https://www.mailercheck.com/pricing.

Who is MailerCheck best for?

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

How well does MailerCheck fit an agentic sales stack?

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