Kickbox provides an API for real-time email verification, list cleaning, and quality scoring to ensure email deliverability.
Kickbox provides an API for real-time email verification, list cleaning, and quality scoring to ensure email deliverability. On Nagent, Kickbox is exposed as a fully-configurable email integration that any agent can call — 2 actions, and API key authentication. No code is required to wire Kickbox into your workflow — connect it once via the External Integrations panel and reuse it across every agent you build.
Agent builders use Kickbox 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 Kickbox 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 Kickbox, with input parameters and output schema. Drop these into any step of an agent built in Helix.
KICKBOX_CHECK_DISPOSABLETool to check if an email address or domain is from a disposable email service. Use when you need to validate whether an email is temporary or throwaway (e.g., mailinator.com, trashmail.com). This is a free public endpoint that does not require authentication.
Input parameters
The email address or domain to check for disposable status (e.g., 'mailinator.com' or 'user@trashmail.com')
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
KICKBOX_SINGLE_VERIFICATION_APITool to verify a single email address via Kickbox. Use when you need real-time validation of an individual email before critical workflows.
Input parameters
Email address to verify
Max milliseconds to wait for SMTP response (0–20000). Server default is 6000
Webhook URL to POST results to
Disable catch-all detection
Deprecated; use `timeout` instead
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 71 agents privately built on Nagent that already use Kickbox.
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Connect Kickbox 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 Kickbox, and click "Connect Now." You'll authenticate with an API key — Nagent handles credential storage and refresh automatically. Once connected, Kickbox is available to any agent in your workspace.
No. Nagent provides no-code integration for every tool. Once Kickbox is connected, you configure its 2 actions directly in the agent builder UI — no API calls, no boilerplate, no schema management.
Helix — Nagent's agentic agent builder — lets you drop Kickbox 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 Kickbox event fires, the agent kicks off automatically.
Every Kickbox 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 Kickbox ships with 2 pre-built email actions, you can layer custom logic around them inside Helix — pre/post-processing steps, conditional branches, retries, or stitching Kickbox together with other connected tools. For deeper customization, talk to our team about Nagent's Agentic AI Lab — forward-deployed engineers who build Kickbox-based workflows tailored to your business.