# 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": "2026-10-05T05:38:32.845Z"
}
```

![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, the OpenAI provider, and the OpenAI SDK
```python
pip install composio composio_openai openai
```

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

#### Path 1, Step 2: Create a Composio session

Initialize Composio with the OpenAI Responses provider and create a session scoped to MailSlurp
```python
import json
from openai import OpenAI
from composio import Composio
from composio_openai import OpenAIResponsesProvider

composio = Composio(provider=OpenAIResponsesProvider())
client = OpenAI()

session = composio.create(user_id="your-user-id", toolkits=["mailslurp"])
tools = session.tools()
```

```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();
```

#### Path 1, Step 3: Run MailSlurp tools with your agent

Send a request, execute the MailSlurp tool calls through the session, and print the final answer
```python
response = client.responses.create(
    model="gpt-5.6-sol",
    tools=tools,
    input=[{"role": "user", "content": "Create a new MailSlurp inbox and send a test email to qa@example.com"}],
)

while True:
    tool_calls = [o for o in response.output if o.type == "function_call"]
    if not tool_calls:
        break
    results = composio.provider.handle_tool_calls(response=response, session=session)
    response = client.responses.create(
        model="gpt-5.6-sol",
        tools=tools,
        previous_response_id=response.id,
        input=[
            {"type": "function_call_output", "call_id": call.call_id, "output": json.dumps(results[i])}
            for i, call in enumerate(tool_calls)
        ],
    )

print(response.output_text)
```

```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);
```

### Path 2: MCP Server Setup

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

Install the Composio SDK and your agent framework
```python
pip install composio claude-agent-sdk
```

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

#### Path 2, Step 2: Create a session with MCP enabled

Create a session scoped to MailSlurp and read its MCP URL and headers
```python
from composio import Composio

composio = Composio()
session = composio.create(user_id="your-user-id", toolkits=["mailslurp"], mcp=True)
```

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

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["mailslurp"],
  mcp: true,
});
```

#### Path 2, Step 3: Connect your agent to the MCP server

Pass the session's MCP URL and headers to your agent and run a MailSlurp request
```python
import asyncio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions, AssistantMessage, TextBlock

options = ClaudeAgentOptions(
    mcp_servers={
        "composio": {
            "type": "http",
            "url": session.mcp.url,
            "headers": session.mcp.headers,
        }
    },
    system_prompt="You are a helpful assistant with access to MailSlurp tools.",
    tools=[],
    allowed_tools=["mcp__composio__*"],
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query("Create a new MailSlurp inbox and send a test email to qa@example.com")
        async for message in client.receive_response():
            if isinstance(message, AssistantMessage):
                for block in message.content:
                    if isinstance(block, TextBlock):
                        print(block.text)

asyncio.run(main())
```

```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();
```

## 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.

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## 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)