Mailmo

Find B2B emails, protect your domain

None readiness

About

What is Mailmo

Mailmo finds and verifies B2B email addresses by searching name-and-domain combinations, running deliverability checks, and flagging catch-all addresses before they hit your sender reputation. It's built for SDRs, BDRs, and founders who are doing outbound at small scale and need accurate contact data without paying for a bloated platform. The standout capability is catch-all verification — Mailmo separates risky catch-all addresses from confirmed deliverable ones, which most entry-level finders skip entirely. A Chrome extension lets you pull emails directly from LinkedIn profiles without leaving the browser. Where it stops being a fit: there's no API and no native CRM integrations, so if you need to push data into HubSpot or Salesforce automatically, you'll be doing that manually or via CSV export.

Data & Discovery

Capabilities

Key features

Email finder

returns verified work emails by name and domain

Also ships

Chrome extension

Our verdict

Vanderbuild take

Mailmo is a no-frills email finder and verifier that makes sense for solo founders and SDRs who need a low-cost way to build a contact list without torching their domain reputation — it's not trying to be a full sales platform, and that focus shows. On the agentic readiness front, there's no API and no MCP server, so you can't drive this from an agent or plug it into an automated workflow without scraping the UI — it's strictly a manual, browser-based tool. Free or near-free, low risk to test — the free tier gives you 50 verified emails a month with no credit card required, which is enough to validate whether the data quality works for your market. The honest limitation is the integration story: with no native connectors and no API, every contact you find has to be exported via CSV and imported elsewhere by hand, which adds friction fast once your volume grows.

Mateusz Sekta

Founder, vanderbuild

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

Data source · Verifier

Where this tool slots into an agentic pipeline.

Plays the role of Data source + Verifier in an agentic pipeline. Use it to source contacts, companies, and the raw inputs an agent needs to act; validate emails or phones before an agent sends or dials.

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