# MailSlurp

```json
{
  "name": "MailSlurp",
  "slug": "mailslurp",
  "url": "https://composio.dev/toolkits/mailslurp",
  "markdown_url": "https://composio.dev/toolkits/mailslurp.md",
  "logo_url": "https://logos.composio.dev/api/mailslurp",
  "categories": [
    "developer tools & devops"
  ],
  "is_composio_managed": false,
  "updated_at": "2026-08-20T15:33:05.153Z"
}
```

![MailSlurp logo](https://logos.composio.dev/api/mailslurp)

## Description

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.

## Summary

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.

## Categories

- developer tools & devops

## Toolkit Details

- Tools: 14

## Images

- Logo: https://logos.composio.dev/api/mailslurp

## Authentication

- **Api Key**
  - Type: `api_key`
  - Description: Api Key authentication for MailSlurp.
  - Setup:
    - Configure Api Key credentials for MailSlurp.
    - Use the credentials when creating an auth config in Composio.

## Suggested Prompts

- Create disposable inbox for signup tests
- Send verification email to test user
- Check latest SMS delivery status

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `MAILSLURP_CREATE_INBOX` | Create Inbox | Create a MailSlurp HTTP or SMTP inbox. HTTP inboxes are the default and can send and receive; SMTP inboxes are receive-only. |
| `MAILSLURP_DELETE_INBOX` | Delete Inbox | Permanently delete one MailSlurp inbox by UUID, including its email address and all emails it contains. This destructive action cannot be undone. |
| `MAILSLURP_GET_ACCOUNT_INFO` | Get Account Info | Return the connected MailSlurp account identity, state, account type, subscription type, and creation time. Use this to check account availability before attempting quota- or plan-sensitive operations. |
| `MAILSLURP_GET_EMAIL` | Get Email | Get one fully hydrated received email by UUID, including parsed headers, body content, recipients, and attachment IDs. Fetching hydrated content may mark the email as read. |
| `MAILSLURP_GET_INBOX` | Get Inbox | Get one MailSlurp inbox by UUID, including its email address, type, labels, and lifecycle state. |
| `MAILSLURP_LIST_CONTACT_GROUPS` | List Contact Groups | List saved MailSlurp contact groups with optional creation-time filters. Returns one page and a continuation cursor. |
| `MAILSLURP_LIST_CONTACTS` | List Contacts | List saved MailSlurp contacts with optional search and creation-time filters. Returns one page and a continuation cursor. |
| `MAILSLURP_LIST_DOMAINS` | List Domains | List custom domains configured for the connected MailSlurp account, including identifiers, domain type, and DNS verification state. |
| `MAILSLURP_LIST_EMAILS` | List Emails | List received emails across the account or one selected inbox with unread, exact-search, favorite, plus-address, and time filters. Returns one page and a continuation cursor. |
| `MAILSLURP_LIST_INBOXES` | List Inboxes | List MailSlurp inboxes with optional search, tag, type, domain, favorite, and creation-time filters. Returns one page and a continuation cursor. |
| `MAILSLURP_LIST_SENT_EMAILS` | List Sent Emails | List sent-email records, optionally filtered by source inbox, exact identifier/address search, and creation time. Returns one page and a continuation cursor. |
| `MAILSLURP_LIST_TEMPLATES` | List Email Templates | List saved MailSlurp email templates with optional creation-time filters. Returns one page and a continuation cursor without large template bodies. |
| `MAILSLURP_SEND_EMAIL` | Send Email | Send an email from a specific MailSlurp inbox to addresses, saved contacts, or one contact group. Supports plain text or HTML, uploaded attachment IDs, and saved templates. The legacy endpoint confirms acceptance but does not return a sent-email record. |
| `MAILSLURP_UPDATE_INBOX` | Update Inbox | Update an inbox's name, description, tags, expiration, or favorite status. Provide at least one field to update. The inbox email address cannot be changed. |

## Supported Triggers

None listed.

## Installation and MCP Setup

### Path 1: SDK Installation

#### Path 1, Step 1: Install Composio

Install the Composio SDK
```python
pip install composio_openai
```

```typescript
npm install @composio/openai
```

#### Path 1, Step 2: Initialize Composio and Create Tool Router Session

Import and initialize Composio client, then create a Tool Router session
```python
from openai import OpenAI
from composio import Composio
from composio_openai import OpenAIResponsesProvider

composio = Composio(provider=OpenAIResponsesProvider())
openai = OpenAI()
session = composio.create(user_id='your-user-id')
```

```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');
```

#### Path 1, Step 3: Execute MailSlurp Tools via Tool Router with Your Agent

Get tools from Tool Router session and execute MailSlurp actions with your Agent
```python
tools = session.tools
response = openai.responses.create(
  model='gpt-4.1',
  tools=tools,
  input=[{
    'role': 'user',
    'content': 'Create a new MailSlurp inbox and send a test email to qa@example.com'
  }]
)
result = composio.provider.handle_tool_calls(
  response=response,
  user_id='your-user-id'
)
print(result)
```

```typescript
const tools = session.tools;
const response = await openai.responses.create({
  model: 'gpt-4.1',
  tools: tools,
  input: [{
    role: 'user',
    content: 'Create a new MailSlurp inbox and send a test email to qa@example.com'
  }],
});
const result = await composio.provider.handleToolCalls(
  'your-user-id',
  response.output
);
console.log(result);
```

### Path 2: MCP Server Setup

#### Path 2, Step 1: Install Composio

Install the Composio SDK for Python or TypeScript
```python
pip install composio claude-agent-sdk
```

```typescript
npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcp
```

#### Path 2, Step 2: Initialize Client and Create Tool Router Session

Import and initialize the Composio client, then create a Tool Router session for MailSlurp
```python
from composio import Composio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions

composio = Composio(api_key='your-composio-api-key')
session = composio.create(user_id='your-user-id')
url = session.mcp.url
```

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

const composio = new Composio({ apiKey: 'your-api-key' });
const session = await composio.create('your-user-id');
console.log(`Tool Router session created: ${session.mcp.url}`);
```

#### Path 2, Step 3: Connect to AI Agent

Use the MCP server with your AI agent (Anthropic Claude or Mastra)
```python
import asyncio

options = ClaudeAgentOptions(
    permission_mode='bypassPermissions',
    mcp_servers={
        'tool_router': {
            'type': 'http',
            'url': url,
            'headers': {
                'x-api-key': 'your-composio-api-key'
            }
        }
    },
    system_prompt='You are a helpful assistant with access to MailSlurp tools.',
    max_turns=10
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query('List my MailSlurp inboxes and show the latest received email in each')
        async for message in client.receive_response():
            if hasattr(message, 'content'):
                for block in message.content:
                    if hasattr(block, 'text'):
                        print(block.text)

asyncio.run(main())
```

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

const client = await createMCPClient({
  transport: {
    type: 'http',
    url: session.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: 'List my MailSlurp inboxes and show the latest received email in each'
  }],
  maxSteps: 5,
});

console.log(`Agent: ${text}`);
```

## Why Use Composio?

### 1. 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

### 2. 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

### 3. 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

### 4. 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

## Use MailSlurp with any AI Agent Framework

Choose a framework you want to connect MailSlurp with:

None listed.

## Related Toolkits

- [Supabase](https://composio.dev/toolkits/supabase) - Supabase is an open-source backend platform offering scalable Postgres databases, authentication, storage, and real-time APIs. It lets developers build modern apps without managing infrastructure.
- [Codeinterpreter](https://composio.dev/toolkits/codeinterpreter) - Codeinterpreter is a Python-based coding environment with built-in data analysis and visualization. It lets you instantly run scripts, plot results, and prototype solutions inside supported platforms.
- [GitHub](https://composio.dev/toolkits/github) - GitHub is a code hosting platform for version control and collaborative software development. It streamlines project management, code review, and team workflows in one place.
- [1password](https://composio.dev/toolkits/_1password) - 1Password is a password manager and digital vault for storing logins, secrets, notes, and secure documents. It helps individuals and teams protect credentials, share access safely, and reduce password risk.
- [Ably](https://composio.dev/toolkits/ably) - Ably is a real-time messaging platform for live chat and data sync in modern apps. It offers global scale and rock-solid reliability for seamless, instant experiences.
- [Abuselpdb](https://composio.dev/toolkits/abuselpdb) - Abuselpdb is a central database for reporting and checking IPs linked to malicious online activity. Use it to quickly identify and report suspicious or abusive IP addresses.
- [Alchemy](https://composio.dev/toolkits/alchemy) - Alchemy is a blockchain development platform offering APIs and tools for Ethereum apps. It simplifies building and scaling Web3 projects with robust infrastructure.
- [Algolia](https://composio.dev/toolkits/algolia) - Algolia is a hosted search API that powers lightning-fast, relevant search experiences for web and mobile apps. It helps developers deliver instant, typo-tolerant, and scalable search without complex infrastructure.
- [Anchor browser](https://composio.dev/toolkits/anchor_browser) - Anchor browser is a developer platform for AI-powered web automation. It transforms complex browser actions into easy API endpoints for streamlined web interaction.
- [Apiflash](https://composio.dev/toolkits/apiflash) - Apiflash is a website screenshot API for programmatically capturing web pages. It delivers high-quality screenshots on demand for automation, monitoring, or reporting.
- [Apiverve](https://composio.dev/toolkits/apiverve) - Apiverve delivers a suite of powerful APIs that simplify integration for developers. It's designed for reliability and scalability so you can build faster, smarter applications without the integration headache.
- [Appcircle](https://composio.dev/toolkits/appcircle) - Appcircle is an enterprise-grade mobile CI/CD platform for building, testing, and publishing mobile apps. It streamlines mobile DevOps so teams ship faster and with more confidence.
- [Appdrag](https://composio.dev/toolkits/appdrag) - Appdrag is a cloud platform for building websites, APIs, and databases with drag-and-drop tools and code editing. It accelerates development and iteration by combining hosting, database management, and low-code features in one place.
- [Appveyor](https://composio.dev/toolkits/appveyor) - AppVeyor is a cloud-based continuous integration service for building, testing, and deploying applications. It helps developers automate and streamline their software delivery pipelines.
- [AWS Marketplace MCP](https://composio.dev/toolkits/aws_marketplace_mcp) - AWS Marketplace MCP provides MCP access to AWS Marketplace's cloud software, data, and services catalog. Use it to discover, compare, and evaluate 30K+ AWS Marketplace listings faster.
- [Backendless](https://composio.dev/toolkits/backendless) - Backendless is a backend-as-a-service platform for mobile and web apps, offering database, file storage, user authentication, and APIs. It helps developers ship scalable applications faster without managing server infrastructure.
- [Baserow](https://composio.dev/toolkits/baserow) - Baserow is an open-source no-code database platform for building collaborative data apps. It makes it easy for teams to organize data and automate workflows without writing code.
- [Bench](https://composio.dev/toolkits/bench) - Bench is a benchmarking tool for automated performance measurement and analysis. It helps you quickly evaluate, compare, and track your systems or workflows.
- [Better stack](https://composio.dev/toolkits/better_stack) - Better Stack is a monitoring, logging, and incident management solution for apps and services. It helps teams ensure application reliability and performance with real-time insights.
- [Bitbucket](https://composio.dev/toolkits/bitbucket) - Bitbucket is a Git-based code hosting and collaboration platform for teams. It enables secure repository management and streamlined code reviews.

## Frequently Asked Questions

### Do I need my own developer credentials to use MailSlurp with Composio?

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

### Can I use multiple toolkits together?

Yes! Composio's Tool Router enables agents to use multiple toolkits. [Learn more](https://docs.composio.dev/tool-router/overview).

### Is Composio secure?

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. [Learn more](https://trust.composio.dev).

### What if the API changes?

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

---
[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)