Mailcheck

email 2 tools available

Mailcheck is an email verification service that helps businesses validate email addresses to ensure deliverability and reduce bounce rates.

Connect Mailcheck Visit Mailcheck

About this integration

Connect Mailcheck to Definable to triage inboxes, draft and queue follow-ups, classify and route incoming threads. Personas call Mailcheck's 2 tools directly from chat or scheduled flows. Hand off to an email persona to triage, draft, and route — with you in the loop on every outbound.

Connect Mailcheck to Definable and it becomes a set of typed tools your agents plan with — triggered by events, run on schedules, or invoked mid-conversation. Every write is checked by the verifier before it lands.

Auth OAuth2 · 2 clicks

Tools 2 exposed

Plans All, incl. Free

Data Never trained on

Mailcheck · in workflows

What teams actually run.

Three patterns teams run with Mailcheck on day one. Each one is a plain-English prompt — no canvas, no glue code — and you can remix them into anything.

Inbox triage

│ Read incoming threads

│ Classify by intent + urgency

└ Draft replies for review

Auto-follow-up

│ Detect emails awaiting reply for 3+ days

│ Draft contextual nudges

└ Queue for one-click send

Lead capture

│ Listen for inbound from a form alias

│ Extract details

└ Push to the CRM

2 tools available

The Mailcheck toolbox.

Every Mailcheck capability your agents can call, each with a typed schema the planner reads. The router picks the right tool per step; the verifier checks the result.

Validate Domain

Tool to validate a domain for disposability, MX records, domain age, and spam indicators. Use when checking if a domain is associated with temporary email services, public email providers, or forwarding services.

Verify Email Address

Tool to verify provided email address. Use after obtaining user email input.

See it run

One prompt, start to finish.

A real prompt, the Mailcheck tools it calls, and what comes back. This is the whole interface — describe the outcome, agents handle the rest.

❯

Run a real Mailcheck task end-to-end — plan it, execute across the API, and hand back a verified result.

mailcheck.validate_domain Tool to validate a domain for disposability, MX records, domain age, and spam indicators.

mailcheck.verify_email_address Tool to verify provided email address. Use after obtaining user email input. · verified

done

Done. Mailcheck responded across 2 calls, the verifier signed off, and the result is logged with every payload.

FAQ · Mailcheck

Questions, answered.

What teams ask before connecting Mailcheck.

01 What can I automate with Mailcheck on Definable?

Anything Mailcheck exposes through its API. Common email workflows on Definable include triage inboxes, draft and queue follow-ups, classify and route incoming threads. Personas can call any of the 2 Mailcheck tools directly, then chain the result into another integration without you writing code.

02 How does Mailcheck authentication work?

Mailcheck uses API_KEY on Definable. You connect once from the integrations page, scoped to the permissions you choose, and from then on any persona that has the integration enabled can act on your behalf. Tokens are encrypted at rest and rotated automatically.

03 Is the Mailcheck integration included in my Definable plan?

Yes — every Definable plan, including Starter, includes access to all 2 Mailcheck tools. You only need a separate Mailcheck subscription if Mailcheck itself charges per seat or per API call.

04 Is using Mailcheck through Definable secure?

Every call from a persona to Mailcheck is logged with the user, persona, prompt, and response. Tokens never leave Definable's secrets vault, scopes are configurable per persona, and you can revoke access at any time from the integration page.

05 How do I get started with Mailcheck on Definable?

Sign up for Definable, open the integrations page, find Mailcheck, and connect via OAuth or API key. You can immediately attach Mailcheck to any persona and start running workflows. The free Starter plan includes 5,000 credits/month.

06 What Mailcheck actions does Definable expose?

Definable exposes all 2 Mailcheck actions as callable tools — including `Validate Domain`, `Verify Email Address`. Each tool gets a typed parameter schema so personas know exactly how to call it.