MailSlurp MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with MailSlurp MCP or direct API to create test inboxes, send emails, inspect received messages, and verify SMS flows through natural language.

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Api Key

MailSlurp is a programmable email and SMS platform for creating inboxes, sending messages, testing flows, and using webhooks. Use it to automate email and SMS testing without managing mail servers or phone infrastructure.

14 Tools

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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 MailSlurp action and event your agent gets out of the box.

Create Inbox

Create a MailSlurp HTTP or SMTP inbox.

Delete Inbox

Permanently delete one MailSlurp inbox by UUID, including its email address and all emails it contains.

Get Account Info

Return the connected MailSlurp account identity, state, account type, subscription type, and creation time.

Get Email

Get one fully hydrated received email by UUID, including parsed headers, body content, recipients, and attachment IDs.

Get Inbox

Get one MailSlurp inbox by UUID, including its email address, type, labels, and lifecycle state.

List Contact Groups

List saved MailSlurp contact groups with optional creation-time filters.

List Contacts

List saved MailSlurp contacts with optional search and creation-time filters.

List Domains

List custom domains configured for the connected MailSlurp account, including identifiers, domain type, and DNS verification state.

List Emails

List received emails across the account or one selected inbox with unread, exact-search, favorite, plus-address, and time filters.

List Inboxes

List MailSlurp inboxes with optional search, tag, type, domain, favorite, and creation-time filters.

List Sent Emails

List sent-email records, optionally filtered by source inbox, exact identifier/address search, and creation time.

List Email Templates

List saved MailSlurp email templates with optional creation-time filters.

Send Email

Send an email from a specific MailSlurp inbox to addresses, saved contacts, or one contact group.

Update Inbox

Update an inbox's name, description, tags, expiration, or favorite status.

SETUP GUIDE

Connect MailSlurp MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
Install the Composio SDK and your agent framework
2

Create a session with MCP enabled

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

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["mailslurp"],
  mcp: true,
});
Create a session scoped to MailSlurp and read its MCP URL and headers
3

Connect your agent to the MCP server

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

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Create a new MailSlurp inbox and send a test email to qa@example.com",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
Pass the session's MCP URL and headers to your agent and run a MailSlurp request
SETUP GUIDE

Connect MailSlurp API Tool with your Agent

1

Install Composio

typescript
npm install @composio/core @composio/openai openai
Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
2

Create a Composio session

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

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["mailslurp"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to MailSlurp
3

Run MailSlurp tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Create a new MailSlurp inbox and send a test email to qa@example.com" }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);
Send a request, execute the MailSlurp tool calls through the session, and print the final answer

Why Use Composio?

AI Native MailSlurp Integration

  • Supports both MailSlurp MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable email and SMS tool execution
  • Rich coverage for creating inboxes, sending test emails, reading messages, and checking delivery data

Managed Auth

  • Store MailSlurp API keys securely instead of hard-coding them in agent code
  • Central place to manage, scope, and revoke MailSlurp access
  • Per user and per environment credentials so dev, staging, and production stay cleanly separated

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Clear action schemas help agents choose the right MailSlurp operation, from inbox creation to message lookup
  • 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 MailSlurp
  • Scoped, least privilege access to MailSlurp inboxes, email actions, SMS workflows, and webhook tools
  • Full audit trail of agent actions to support review and compliance
FAQ

Frequently asked questions

Yes, MailSlurp 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.

Yes. Composio is SOC 2 Type II compliant and is built to keep your MailSlurp connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

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

Create the key in your MailSlurp account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the MailSlurp actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside MailSlurp at any time.

When you connect a MailSlurp account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in MailSlurp as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside MailSlurp. If MailSlurp lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside MailSlurp at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each MailSlurp connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

The connection stops working the moment MailSlurp rejects the old key. Create a new key in MailSlurp and reconnect the account from the Composio dashboard or by asking your agent to reconnect MailSlurp. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal MailSlurp use. Paid plans add higher limits and team features. Your MailSlurp plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple MailSlurp accounts).

With Composio, you connect MailSlurp once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

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