Mailersend MCP for AI Agents

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Mailersend MCP or direct API to send transactional emails, check delivery status, manage recipients, and fetch analytics through natural language.

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Api Key

MailerSend is a transactional email platform for developers to send, receive, and track emails via API. It provides reliable deliverability, analytics, and easy integration for your apps.

23 Tools

Try Mailersend now

Type what you want done — sign in and watch it run live in the Tool Router playground.

TOOL ROUTER PLAYGROUND
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TOOLS

Supported Tools

Every Mailersend action and event your agent gets out of the box.

Create Sending Domain

Tool to add a new sending domain to MailerSend.

Create SMTP User

Tool to create a new SMTP user.

Create API Token

Creates a new API token with specified scopes (permissions) for a domain.

Create Webhook

Tool to create a new webhook for a MailerSend domain.

Delete Webhook

Tool to delete an existing webhook.

Get API Quota

Tool to retrieve current API usage quota.

Get Domain

Tool to retrieve detailed information about a specific sending domain in MailerSend.

List Domain Recipients

Tool to list recipients for a domain.

Get sending domains

Retrieve a paginated list of all sending domains configured in your MailerSend account.

Get general API resources

Tool to retrieve general API resources and information.

List Sender Identities

Retrieves a paginated list of sender identities configured in your MailerSend account.

Get sent messages

Tool to retrieve a paginated list of sent messages.

Get email recipients

Tool to retrieve a list of email recipients.

Get SMS Activity

Tool to retrieve SMS activity logs.

Get SMS Inbounds

Retrieve inbound SMS route configurations.

List SMS Messages

Retrieves a paginated list of SMS messages sent through the MailerSend API.

Get SMS Numbers

Tool to retrieve a paginated list of SMS phone numbers.

Get SMS recipients

Tool to retrieve a list of SMS recipients.

Get SMTP users

Tool to retrieve a list of SMTP users.

Get email templates

Retrieves a paginated list of email templates from your MailerSend account.

Get API Tokens

Retrieves a paginated list of API tokens associated with your MailerSend account.

Get users

Tool to retrieve a list of users associated with your account.

List webhooks

Tool to retrieve a list of webhooks.

SETUP GUIDE

Connect Mailersend MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcp
Install the Composio SDK and Claude Agent SDK
2

Create Tool Router Session

typescript
import { Composio } from '@composio/core';

const composio = new Composio({ apiKey: 'your-api-key' });

console.log("Creating Tool Router session...");
const { mcp } = await composio.create('your-user-id');
console.log(`Tool Router session created: ${mcp.url}`);
Initialize the Composio client and create a Tool Router session
3

Connect to AI Agent

typescript
import { openai } from '@ai-sdk/openai';
import { experimental_createMCPClient as createMCPClient } from '@ai-sdk/mcp';
import { generateText, stepCountIs } from 'ai';

const client = await createMCPClient({
  transport: {
    type: 'http',
    url: mcp.url,
    headers: { 'x-api-key': 'your-composio-api-key' }
  }
});

const tools = await client.tools();

const { text } = await generateText({
  model: openai('gpt-4o'),
  tools,
  messages: [{ role: 'user', content: 'Send a transactional email to support@example.com with subject "Order Update"' }],
  stopWhen: stepCountIs( 5 )
});

console.log(`Agent: ${text}`);
Use the MCP server with your AI agent
SETUP GUIDE

Connect Mailersend API Tool with your Agent

1

Install Composio

typescript
npm install @composio/openai
Install the Composio SDK
2

Initialize Composio and Create Tool Router Session

typescript
import OpenAI from 'openai';
import { Composio } from '@composio/core';
import { OpenAIResponsesProvider } from '@composio/openai';

const composio = new Composio({
  provider: new OpenAIResponsesProvider(),
});
const openai = new OpenAI({});
const session = await composio.create('your-user-id');
Import and initialize Composio client, then create a Tool Router session
3

Execute Mailersend Tools via Tool Router with Your Agent

typescript
const tools = session.tools;
const response = await openai.responses.create({
  model: 'gpt-4.1',
  tools: tools,
  input: [{
    role: 'user',
    content: 'Send a welcome email to a new user'
  }],
});
const result = await composio.provider.handleToolCalls(
  'your-user-id',
  response.output
);
console.log(result);
Get tools from Tool Router session and execute Mailersend actions with your Agent

Why Use Composio?

AI Native Mailersend Integration

  • Supports both Mailersend MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for sending, fetching, and querying Mailersend emails

Managed Auth

  • Built-in API key handling and secure storage
  • Central place to manage, scope, and rotate Mailersend access
  • Per user and per environment credentials instead of hard-coded keys

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Comprehensive execution logs so you always know what ran, when, and on whose behalf

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access Mailersend
  • Scoped, least privilege access to Mailersend resources
  • Full audit trail of agent actions to support review and compliance
FAQ

Frequently asked questions

Yes, Mailersend requires you to configure your own API key. Once set up, Composio handles secure credential storage and API request handling for you.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. Learn more.

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

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