A simple REST-based JSON API for email address validation and verification.
A simple REST-based JSON API for email address validation and verification. On Nagent, Mailboxlayer is exposed as a fully-configurable email integration that any agent can call — 1 action, and API key authentication. No code is required to wire Mailboxlayer into your workflow — connect it once via the External Integrations panel and reuse it across every agent you build.
Agent builders use Mailboxlayer to automate the kinds of tasks email teams previously handled manually. Concrete examples — each one is a single agent step in Nagent — include:
Every action and trigger is paired with a structured input/output schema (visible in the sections below), so when you wire Mailboxlayer into Helix — our agentic agent builder — the editor knows exactly what each step expects and produces. Configure once, deploy anywhere across your Nagent agents.
Every operation an agent can call against Mailboxlayer, with input parameters and output schema. Drop these into any step of an agent built in Helix.
MAILBOXLAYER_CHECK_EMAILTool to validate a single email address. Use when you need to check syntax, domain, SMTP, and meta-flags.
Input parameters
Enable MX record check (1) or not (0).
Detect free email providers (1) or not (0).
Detect role-based addresses (1) or not (0).
Enable SMTP check (1) or not (0).
The email address to validate.
Enable strict format validation (1) or not (0).
Detect catch-all addresses (1) or not (0).
Your API access key for mailboxlayer.
Detect disposable email addresses (1) or not (0).
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
No publicly available marketplace agent is found using this tool yet. There are 95 agents privately built on Nagent that already use Mailboxlayer.
Build on Nagent
Connect Mailboxlayer to any Nagent agent in minutes — no API key management, no boilerplate. Just configure and deploy.
The five questions agent builders ask before adopting a new integration.
Open the External Integrations panel inside Nagent (app.nagent.ai/externalIntegration), find Mailboxlayer, and click "Connect Now." You'll authenticate with an API key — Nagent handles credential storage and refresh automatically. Once connected, Mailboxlayer is available to any agent in your workspace.
No. Nagent provides no-code integration for every tool. Once Mailboxlayer is connected, you configure its 1 action directly in the agent builder UI — no API calls, no boilerplate, no schema management.
Helix — Nagent's agentic agent builder — lets you drop Mailboxlayer steps into any workflow visually. Pick an action (e.g., one of those listed above), fill in the inputs (Helix knows the required vs. optional schema for each parameter), and connect it to upstream/downstream steps. Triggers run as the entry point of an agent, so when a Mailboxlayer event fires, the agent kicks off automatically.
Every Mailboxlayer action and trigger ships with a fully-typed schema — input parameters with name, type, required flag, and description, plus the output payload shape. The schemas are documented in the sections above. Helix uses these schemas to validate your configuration at build time and to type-check the data flowing between steps.
Yes. While Mailboxlayer ships with 1 pre-built email action, you can layer custom logic around them inside Helix — pre/post-processing steps, conditional branches, retries, or stitching Mailboxlayer together with other connected tools. For deeper customization, talk to our team about Nagent's Agentic AI Lab — forward-deployed engineers who build Mailboxlayer-based workflows tailored to your business.