Mailboxlayer

email 1 tool available

A simple REST-based JSON API for email address validation and verification.

About this integration

Connect Mailboxlayer to Definable to triage inboxes, draft and queue follow-ups, classify and route incoming threads. Personas call Mailboxlayer's 1 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 Mailboxlayer 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 1 exposed

Plans All, incl. Free

Data Never trained on

Mailboxlayer · in workflows

What teams actually run.

Three patterns teams run with Mailboxlayer 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

1 tools available

The Mailboxlayer toolbox.

Every Mailboxlayer 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.

Check Email Validity

Tool to validate a single email address. Use when you need to check syntax, domain, SMTP, and meta-flags.

See it run

One prompt, start to finish.

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

❯

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

mailboxlayer.check_email_validity Tool to validate a single email address. Use when you need to check syntax, domain, SMTP, · verified

done

Done. Mailboxlayer responded across 1 call, the verifier signed off, and the result is logged with every payload.

FAQ · Mailboxlayer

Questions, answered.

What teams ask before connecting Mailboxlayer.

01 What can I automate with Mailboxlayer on Definable?

Anything Mailboxlayer 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 1 Mailboxlayer tool directly, then chain the result into another integration without you writing code.

02 How does Mailboxlayer authentication work?

Mailboxlayer 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 Mailboxlayer integration included in my Definable plan?

Yes — every Definable plan, including Starter, includes access to all 1 Mailboxlayer tool. You only need a separate Mailboxlayer subscription if Mailboxlayer itself charges per seat or per API call.

04 Is using Mailboxlayer through Definable secure?

Every call from a persona to Mailboxlayer 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 Mailboxlayer on Definable?

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

06 What Mailboxlayer actions does Definable expose?

Definable exposes all 1 Mailboxlayer action as callable tools — including `Check Email Validity`. Each tool gets a typed parameter schema so personas know exactly how to call it.