How to Use the MailerSend MCP in Mastra AI

Q: How do I add MailerSend tools to a Mastra AI agent?

Instantiate the MCPClient from @mastra/mcp pointing to your Vinkius server URL. Call mcpClient.listTools() and spread them into your Mastra Agent's tool array so the agent can access sendtransactionalemail natively.

Q: Can Mastra AI handle human-in-the-loop for MailerSend?

Yes, you can use the requireToolApproval option in Mastra. This pauses the workflow and waits for admin approval before the agent can execute high-volume tools like sendbulktransactionalemails.

Build self-healing transactional email pipelines and verify domains using Mastra AI.

See Vinkius in Action

Works with every AI agent you already use

…and any MCP-compatible client

MCP Servers - Free for Subscribers

Connect MailerSend MCP to Mastra AI

Create your Vinkius account to connect MailerSend 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.

GDPR Free for Subscribers

Setup MailerSend with Mastra AI

Ask AI about this MCP

ChatGPT

Claude

Perplexity

Build self-healing transactional email workflows

Trigger `send_transactional_email` inside your Mastra AI workflows to handle transactional sends with automatic retries. If a send fails due to a network issue, Mastra's built-in engine retries with exponential backoff. You can write conditional logic that checks if a domain is verified via `get_sender_domain_details` before attempting a run. If the domain is unverified, the workflow can automatically trigger `verify_sender_domain` and notify your team.

Automate domain onboarding with Mastra AI and MCP

Run `list_sender_domains` to build an automated domain setup pipeline using Mastra's agent framework. The agent can fetch all active domains and check their verification status one by one. When an unverified domain is found, the agent triggers `verify_sender_domain` and monitors the activity log using `list_domain_activity`. This removes the need for cron jobs or manual polling scripts.

Sync recipient databases and clean lists

Query `list_email_recipients` to keep your internal databases in sync with MailerSend. Your Mastra workflows can fetch recipient records and retrieve detailed metadata with `get_recipient_details` to flag bounced addresses. This data can then be routed to your CRM or internal database. By automating this loop, you ensure you never send transactional messages to dead inboxes, protecting your sender reputation.

Setup guide

Set up MailerSend 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 MailerSend 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: "mailersend-mcp-client",
  servers: {
    "mailersend-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

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

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

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by MailerSend. 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.

Why Choose Vinkius

Vinkius connects your tools to AI with real-time monitoring and automatic cost savings — all from one dashboard.

Connect MailerSend now

Real-time monitoring

Live

visibility into every interaction

Connect your favorite tools to your AI and see exactly what's happening — every request, every response, in real time.

Built-in savings

60%

lower AI costs

Vinkius compresses data between your apps and your AI automatically. Lower bills every month — no configuration required.

Single dashboard

One

place for every integration

Every tool your AI connects to, managed from a single screen. One account, complete control.

Common questions about MailerSend MCP in Mastra AI

Instantiate the `MCPClient` from `@mastra/mcp` pointing to your Vinkius server URL. Call `mcpClient.listTools()` and spread them into your Mastra Agent's tool array so the agent can access `send_transactional_email` natively.

Yes, you can use the `requireToolApproval` option in Mastra. This pauses the workflow and waits for admin approval before the agent can execute high-volume tools like `send_bulk_transactional_emails`.

You can set up a step in your workflow that triggers when a delivery failure is detected. The agent can call `get_sent_message_details` to inspect the bounce reason and log it directly to your monitoring system.

Yes, Mastra runs on standard Node.js and connects to the Vinkius MCP Server via HTTP or SSE. You can test your transactional email workflows locally before deploying them to your production cloud.

All recipient email addresses and transactional message payloads are processed in memory within Vinkius's ephemeral V8 sandbox. Your credentials and recipient data are never cached or written to disk, complying with strict data privacy standards.

Use it with your favorite AI tools

Connect this server to Cursor, Claude, VS Code, and more.

OpenAI Agents SDK sdk-python

Google ADK sdk-python

Pydantic AI sdk-python

Vercel AI SDK sdk-typescript