How to Use the MailerCheck MCP in Mastra AI

Q: How does my Mastra AI agent access the MailerCheck tools?

You configure the Vinkius URL in your MCPClient setup. Mastra AI then automatically discovers the available MailerCheck tools. You can pass them directly to your agent's toolset.

Q: Can I require human approval for a MailerCheck batch in Mastra AI?

Yes. You can configure your agent with requireToolApproval for the createverificationbatch tool. The workflow will pause and wait for a person to approve the action before sending the email list to MailerCheck.

Q: What's the difference between verifysingleemail and createverificationbatch?

Use verifysingleemail for quick, synchronous checks, like in a signup form. Use createverificationbatch for large lists of emails where the check can run asynchronously in the background.

Build failure-proof email validation workflows for your Mastra AI agents. Automatically clean lists and handle bad data.

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Connect MailerCheck MCP to Mastra AI

Create your Vinkius account to connect MailerCheck to Mastra AI and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup MailerCheck with Mastra AI

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Build Resilient List Cleaning Jobs

Use this MCP server to build a rock-solid list cleaning workflow. Your Mastra AI agent can take a list of emails, call `create_verification_batch`, and get back a batch ID. Mastra's built-in retry logic means if the network flakes when your agent calls `get_batch_results`, it will automatically try again. You don't have to write any boilerplate for handling transient API errors. It just works.

Combine Real-time and Batch Checks

Design a smart onboarding flow. When a new user signs up, your agent first tries `verify_single_email`. If the email is invalid, the workflow can branch—instead of creating an account, it can add the user to a quarantine list for review. A separate, scheduled agent can then run `create_verification_batch` on that quarantine list once a day. This combines immediate feedback with robust, asynchronous cleanup, all defined in your Mastra workflow.

Prevent Workflow Failures with Credit Checks

Don't let a workflow fail halfway through a 10,000-email batch job because you ran out of credits. Mastra's conditional logic makes it easy to build safer workflows. As the first step in your workflow, have the agent call `get_account_info`. If the credit balance is below your threshold, the agent can pause the job and send a notification to an admin. This prevents failed jobs and wasted processing time.

Setup guide

Set up MailerCheck MCP in Mastra AI

Prerequisites

Node.js 18+ and a TypeScript project
@mastra/mcp + @mastra/core packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run npm install @mastra/mcp @mastra/core plus your preferred model provider (e.g. @ai-sdk/openai).
2

Configure the MCPClient
Create an MCPClient with your Vinkius endpoint as a URL object. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and inject tools
Call mcpClient.listTools() and spread the result into your agent's tools object. All MailerCheck tools become native Mastra tools.
4

Run with any model
Swap openai("gpt-4o") for any AI SDK-compatible provider. Call agent.generate() and the agent routes tool calls through MCP automatically.

agent.ts

import { MCPClient } from "@mastra/mcp";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const mcpClient = new MCPClient({
  id: "mailercheck-mcp-client",
  servers: {
    "mailercheck-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

const agent = new Agent({
  name: "MailerCheck Agent",
  model: openai("gpt-4o"),
  instructions: "You have access to MailerCheck tools.",
  tools: {
    ...(await mcpClient.listTools()),
  },
});

const result = await agent.generate(
  "List recent MailerCheck transactions"
);
console.log(result.text);

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by MailerCheck. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about MailerCheck MCP in Mastra AI

You configure the Vinkius URL in your `MCPClient` setup. Mastra AI then automatically discovers the available MailerCheck tools. You can pass them directly to your agent's toolset.

Yes. You can configure your agent with `requireToolApproval` for the `create_verification_batch` tool. The workflow will pause and wait for a person to approve the action before sending the email list to MailerCheck.

Mastra AI has automatic retries with exponential backoff built in. If a call to a MailerCheck tool fails due to a temporary network issue or a rate limit, the agent will wait and try again automatically.

Use `verify_single_email` for quick, synchronous checks, like in a signup form. Use `create_verification_batch` for large lists of emails where the check can run asynchronously in the background.

Yes. The email addresses you process are sent over an encrypted HTTPS connection to the Vinkius MCP endpoint. Vinkius acts as a secure proxy, passing the data to MailerCheck without storing it. Your data only exists in transit.

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