# How to integrate Smtp2go MCP with Claude Code

```json
{
  "title": "How to integrate Smtp2go MCP with Claude Code",
  "toolkit": "Smtp2go",
  "toolkit_slug": "smtp2go",
  "framework": "Claude Code",
  "framework_slug": "claude-code",
  "url": "https://composio.dev/toolkits/smtp2go/framework/claude-code",
  "markdown_url": "https://composio.dev/toolkits/smtp2go/framework/claude-code.md",
  "updated_at": "2026-05-06T08:29:13.142Z"
}
```

## Introduction

Manage your Smtp2go directly from Claude Code with zero worries about OAuth hassles, API-breaking issues, or reliability and security concerns.
You can do this in two different ways:
- Via [Composio Connect](https://dashboard.composio.dev/login?utm_source=toolkits&utm_medium=framework_template&utm_campaign=claude-code&utm_content=composio_connect&next=%2F~%2Forg%2Fconnect%2Fclients%2Fclaude-code) - Direct and easiest approach
- Via [Composio SDK](https://docs.composio.dev/docs?utm_source=toolkits&utm_medium=framework_template&utm_campaign=claude-code&utm_content=composio_sdk) - Programmatic approach with more control

## Also integrate Smtp2go with

- [OpenAI Agents SDK](https://composio.dev/toolkits/smtp2go/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/smtp2go/framework/claude-agents-sdk)
- [Claude Cowork](https://composio.dev/toolkits/smtp2go/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/smtp2go/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/smtp2go/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/smtp2go/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/smtp2go/framework/cli)
- [Google ADK](https://composio.dev/toolkits/smtp2go/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/smtp2go/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/smtp2go/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/smtp2go/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/smtp2go/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/smtp2go/framework/crew-ai)

## TL;DR

- Only one MCP URL to connect multiple apps with Claude Code with zero auth hassles.
- Programmatic tool calling allows LLMs to write its code in a remote workbench to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
- Handling Large tool responses out of LLM context to minimize context rot.
- Dynamic just-in-time access to 20,000 tools across 1000+ other Apps for cross-app workflows. It loads the tools you need, so LLMs aren't overwhelmed by tools you don't need.

## Connect Smtp2go to Claude Code

### Connecting Smtp2go to Claude Code using Composio
1. Add the Composio MCP to Claude

```bash
claude mcp add --scope user --transport http composio https://connect.composio.dev/mcp
```

## What is Claude Code?

Claude Code is Anthropic's command line developer tool that lets you use Claude directly inside your terminal. Instead of switching between your editor, browser, and chat, you can stay in your project folder and ask Claude to help you build, debug, refactor, and understand code right where you're working.
Key features include:
- Terminal-Native Experience: Work with Claude directly in your command line without switching contexts
- MCP Support: Built-in support for Model Context Protocol servers to extend Claude's capabilities
- Project Context: Claude understands your project structure and can read, write, and modify files
- Interactive Development: Ask questions, debug code, and get help in real-time while coding
- Multi-Platform: Works on macOS, Linux, WSL, and Windows

## What is the Smtp2go MCP server, and what's possible with it?

The Smtp2go MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Smtp2go account. It provides structured and secure access to your email sending and management infrastructure, so your agent can perform actions like searching email activity, managing allowed senders, updating sender domains, and controlling IP allow lists on your behalf.
- Comprehensive email activity search: Ask your agent to filter and retrieve email events such as sends, opens, clicks, and bounces by recipient, date, or message ID.
- Allowed sender management: Have your agent add, update, remove, or view allowed sender email addresses to control who can send emails from your account.
- Sender domain configuration: Let the agent register new sender domains for SPF/DKIM verification and manage domain-related settings seamlessly.
- IP allow list control: Direct your agent to add or remove IP addresses or CIDR ranges in your account’s IP allow list, enhancing security for sending sources.
- Email delivery monitoring: Enable your agent to search and analyze sent emails, helping you monitor delivery, troubleshoot issues, and ensure reliable communication.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `SMTP2GO_ACTIVITY_SEARCH` | Search Email Activity | Tool to search activity events like sends, opens, clicks, and bounces. use when you need to filter account email activity by date, event, recipient, or message id. |
| `SMTP2GO_ALLOWED_SENDERS_ADD` | Add Allowed Sender | Tool to add a new allowed sender email address. use when you need to whitelist a sender before sending email. example: add "user@example.com" to allowed senders list. |
| `SMTP2GO_ALLOWED_SENDERS_REMOVE` | Remove Allowed Sender | Tool to remove a sender email address from the allowed senders list. use when you need to revoke send permissions for a validated address. |
| `SMTP2GO_ALLOWED_SENDERS_UPDATE` | Update Allowed Sender | Tool to update details of an existing allowed sender. use after confirming the allowed sender id. |
| `SMTP2GO_ALLOWED_SENDERS_VIEW` | View Allowed Senders | Tool to view the list of allowed senders configured in your account. use after setting up smtp2go authentication to retrieve your allowed-senders list. example: 'show me all verified allowed senders.' |
| `SMTP2GO_DOMAIN_ADD` | Add Sender Domain | Tool to add a new sender domain for spf/dkim verification. use when you need to register a domain and optionally set tracking/return-path subdomains. |
| `SMTP2GO_EMAIL_SEARCH` | Search SMTP2GO Emails | Tool to search sent emails. use when filtering your smtp2go account's email activity by criteria like date, sender, or recipient. call after authentication. |
| `SMTP2GO_IP_ALLOW_LIST_ADD` | Add IP Allow List | Tool to add an ip address or cidr range to your account’s ip allow list. use when you need to whitelist specific sending sources by ip or cidr after confirming accuracy. |
| `SMTP2GO_IP_ALLOW_LIST_REMOVE` | Remove IP from Allow List | Tool to remove an ip address from your account's ip allow list. use after identifying the ip you wish to revoke. |
| `SMTP2GO_IP_ALLOW_LIST_VIEW` | View IP Allow List | Tool to view the list of ip addresses in your ip allow list. use after confirming your smtp2go api key is set. |
| `SMTP2GO_SMS_VIEW_RECEIVED` | View Received SMS | Tool to retrieve received sms replies for your smtp2go account. use when you need to fetch incoming sms messages for analysis or display. pagination supported via limit and offset. |
| `SMTP2GO_STATS_EMAIL_BOUNCES` | Get Email Bounces Stats | Tool to retrieve email bounces statistics. use after sending emails to analyze bounce metrics over a time period. |
| `SMTP2GO_STATS_EMAIL_CYCLE` | Email Cycle Statistics | Tool to retrieve email cycle statistics. use when you need to analyze email delivery metrics over a specified date range. |
| `SMTP2GO_STATS_EMAIL_HISTORY` | Email History Statistics | Tool to retrieve email history statistics. use when you need detailed delivery metrics within a date range. |
| `SMTP2GO_STATS_EMAIL_SPAM` | Email Spam Statistics | Tool to retrieve email spam report statistics. use when analyzing spam trends for sent emails. |
| `SMTP2GO_STATS_EMAIL_UNSUBS` | Email Unsubscription Stats | Tool to retrieve email unsubscribe statistics. use when you need unsubscribe data for your account over a date range. |
| `SMTP2GO_SUBACCOUNTS_SEARCH` | Search Subaccounts | Tool to search subaccounts. use after authenticating to filter and paginate your subaccounts by name, email, or status. |
| `SMTP2GO_SUBACCOUNTS_USAGE` | Subaccounts Usage | Tool to retrieve usage statistics for subaccounts. use when you need to monitor per-subaccount email usage. |
| `SMTP2GO_SUPPRESSION_ADD` | Add to Suppression List | Tool to add email addresses or domains to the suppression list. use when you need to block sending emails to specific recipients or entire domains after unsubscribes or bounces. |
| `SMTP2GO_SUPPRESSION_REMOVE` | Remove suppression entry | Tool to remove an email address or domain from the suppression list. use when you want to resume sending to the address or domain. |
| `SMTP2GO_SUPPRESSION_VIEW` | View Suppression List | Tool to view the suppression list. use when you need to inspect suppressed email addresses in your account. |
| `SMTP2GO_TEMPLATE_EDIT` | Edit Email Template | Tool to edit details of an existing email template. use when you need to update template properties after confirming its id. |
| `SMTP2GO_TEMPLATE_SEARCH` | Search Email Templates | Tool to search your collection of email templates by id or name. use when you need to find templates matching specific criteria after authentication. |
| `SMTP2GO_TEMPLATE_VIEW` | View Email Template | Tool to view details of a specific email template. use after you have the template id to inspect. |
| `SMTP2GO_USERS_SMTP_ADD` | Add SMTP User | Tool to add a new smtp user. use when you need to provision a fresh smtp credential after collecting username and password. |
| `SMTP2GO_USERS_SMTP_EDIT` | Edit SMTP User | Tool to edit details of an existing smtp user. use when you need to update username, password, sender restrictions, or enable/disable a user after confirming the target username. |
| `SMTP2GO_USERS_SMTP_REMOVE` | Remove SMTP User | Tool to remove an smtp user from your account. use when you need to revoke smtp access for a user. |
| `SMTP2GO_USERS_SMTP_VIEW` | View SMTP Users | Tool to list all smtp users configured on your account. use when you need to retrieve smtp user configurations. |
| `SMTP2GO_WEBHOOK_ADD` | Add Webhook | Tool to create a new webhook. use when you need real-time notifications of email or sms events. |
| `SMTP2GO_WEBHOOK_EDIT` | Edit Webhook | Tool to edit an existing webhook’s settings. use when you need to update a webhook's configuration after creation. |
| `SMTP2GO_WEBHOOK_REMOVE` | Remove webhook | Tool to remove a webhook. use when you want to delete a webhook by its id from your smtp2go account. |
| `SMTP2GO_WEBHOOK_VIEW` | View Webhooks | Tool to view all webhooks configured in your account. use when you need to inspect existing webhook configurations after setup. |

## Supported Triggers

None listed.

## Creating MCP Server - Stand-alone vs Composio SDK

The Smtp2go MCP server is an implementation of the Model Context Protocol that connects Claude Code (and other AI assistants like Claude and Cursor) directly to your Smtp2go account. It provides structured and secure access so Claude can perform Smtp2go operations on your behalf.
With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster.

## Step-by-step Guide

### 1. Prerequisites

Before starting, make sure you have:
- Claude Pro, Max, or API billing enabled Anthropic account
- Composio API Key
- A Smtp2go account
- Basic knowledge of Python or TypeScript

### 1. Install Claude Code

To install Claude Code, use one of the following methods based on your operating system:
```bash
# macOS, Linux, WSL
curl -fsSL https://claude.ai/install.sh | bash

# Windows PowerShell
irm https://claude.ai/install.ps1 | iex

# Windows CMD
curl -fsSL https://claude.ai/install.cmd -o install.cmd && install.cmd && del install.cmd
```

### 2. Set up Claude Code

Open a terminal, go to your project folder, and start Claude Code:
- Claude Code will open in your terminal
- Follow the prompts to sign in with your Anthropic account
- Complete the authentication flow
- Once authenticated, you can start using Claude Code
```bash
cd your-project-folder
claude
```

### 3. Set up environment variables

Create a .env file in your project root with the following variables:
- COMPOSIO_API_KEY authenticates with Composio (get it from [Composio dashboard](https://dashboard.composio.dev/login?utm_source=toolkits&utm_medium=framework_template&utm_campaign=claude-code&utm_content=api_key&next=%2F~%2Forg%2Fconnect%2Fclients%2Fclaude-code))
- USER_ID identifies the user for session management (use any unique identifier)
```bash
COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
```

### 4. Install Composio library

No description provided.
```python
pip install composio-core python-dotenv
```

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

### 5. Generate Composio MCP URL

No description provided.
```python
import os
from composio import Composio
from dotenv import load_dotenv

load_dotenv()

COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
USER_ID = os.getenv("USER_ID")

composio_client = Composio(api_key=COMPOSIO_API_KEY)

composio_session = composio_client.create(
    user_id=USER_ID,
    toolkits=["smtp2go"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url

print(f"MCP URL: {COMPOSIO_MCP_URL}")
print(f"\nUse this command to add to Claude Code:")
print(f'claude mcp add --transport http smtp2go-composio "{COMPOSIO_MCP_URL}" --headers "X-API-Key:{COMPOSIO_API_KEY}"')
```

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

const { COMPOSIO_API_KEY, USER_ID } = process.env;

if (!COMPOSIO_API_KEY || !USER_ID) {
  throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
}

const composioClient = new Composio({ apiKey: COMPOSIO_API_KEY });

const composioSession = await composioClient.create(USER_ID, {
  toolkits: ['smtp2go'],
});

const composioMcpUrl = composioSession?.mcp.url;

console.log(`MCP URL: ${composioMcpUrl}`);
console.log(`\nUse this command to add to Claude Code:`);
console.log(`claude mcp add --transport http smtp2go-composio "${composioMcpUrl}" --headers "X-API-Key:${COMPOSIO_API_KEY}"`);
```

### 6. Run the script and copy the MCP URL

No description provided.
```python
python generate_mcp_url.py
```

```typescript
node --loader ts-node/esm generate_mcp_url.ts
# or if using tsx
tsx generate_mcp_url.ts
```

### 7. Add Smtp2go MCP to Claude Code

In your terminal, add the MCP server using the command from the previous step. The command format is:
- claude mcp add registers a new MCP server with Claude Code
- --transport http specifies that this is an HTTP-based MCP server
- The server name (smtp2go-composio) is how you'll reference it
- The URL points to your Composio Tool Router session
- --headers includes your Composio API key for authentication
After running the command, close the current Claude Code session and start a new one for the changes to take effect.
```bash
claude mcp add --transport http smtp2go-composio "YOUR_MCP_URL_HERE" --headers "X-API-Key:YOUR_COMPOSIO_API_KEY"

# Then restart Claude Code
exit
claude
```

### 8. Verify the installation

Check that your Smtp2go MCP server is properly configured.
- This command lists all MCP servers registered with Claude Code
- You should see your smtp2go-composio entry in the list
- This confirms that Claude Code can now access Smtp2go tools
If everything is wired up, you should see your smtp2go-composio entry listed:
```bash
claude mcp list
```

### 9. Authenticate Smtp2go

The first time you try to use Smtp2go tools, you'll be prompted to authenticate.
- Claude Code will detect that you need to authenticate with Smtp2go
- It will show you an authentication link
- Open the link in your browser (or copy/paste it)
- Complete the Smtp2go authorization flow
- Return to the terminal and start using Smtp2go through Claude Code
Once authenticated, you can ask Claude Code to perform Smtp2go operations in natural language. For example:
- "Search for bounced emails this week"
- "Add marketing@mydomain.com as allowed sender"
- "List all verified sender domains"

## Complete Code

```python
import os
from composio import Composio
from dotenv import load_dotenv

load_dotenv()

COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
USER_ID = os.getenv("USER_ID")

composio_client = Composio(api_key=COMPOSIO_API_KEY)

composio_session = composio_client.create(
    user_id=USER_ID,
    toolkits=["smtp2go"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url

print(f"MCP URL: {COMPOSIO_MCP_URL}")
print(f"\nUse this command to add to Claude Code:")
print(f'claude mcp add --transport http smtp2go-composio "{COMPOSIO_MCP_URL}" --headers "X-API-Key:{COMPOSIO_API_KEY}"')
```

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

const { COMPOSIO_API_KEY, USER_ID } = process.env;

if (!COMPOSIO_API_KEY || !USER_ID) {
  throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
}

const composioClient = new Composio({ apiKey: COMPOSIO_API_KEY });

const composioSession = await composioClient.create(USER_ID, {
  toolkits: ['smtp2go'],
});

const composioMcpUrl = composioSession?.mcp.url;

console.log(`MCP URL: ${composioMcpUrl}`);
console.log(`\nUse this command to add to Claude Code:`);
console.log(`claude mcp add --transport http smtp2go-composio "${composioMcpUrl}" --headers "X-API-Key:${COMPOSIO_API_KEY}"`);
```

## Conclusion

You've successfully integrated Smtp2go with Claude Code using Composio's MCP server. Now you can interact with Smtp2go directly from your terminal using natural language commands.
Key features of this setup:
- Terminal-native experience without switching contexts
- Natural language commands for Smtp2go operations
- Secure authentication through Composio's managed MCP
- Tool Router for dynamic tool discovery and execution
Next steps:
- Try asking Claude Code to perform various Smtp2go operations
- Add more toolkits to your Tool Router session for multi-app workflows
- Integrate this setup into your development workflow for increased productivity
You can extend this by adding more toolkits, implementing custom workflows, or building automation scripts that leverage Claude Code's capabilities.

## How to build Smtp2go MCP Agent with another framework

- [OpenAI Agents SDK](https://composio.dev/toolkits/smtp2go/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/smtp2go/framework/claude-agents-sdk)
- [Claude Cowork](https://composio.dev/toolkits/smtp2go/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/smtp2go/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/smtp2go/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/smtp2go/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/smtp2go/framework/cli)
- [Google ADK](https://composio.dev/toolkits/smtp2go/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/smtp2go/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/smtp2go/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/smtp2go/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/smtp2go/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/smtp2go/framework/crew-ai)

## Related Toolkits

- [Apilio](https://composio.dev/toolkits/apilio) - Apilio is a home automation platform that lets you connect and control smart devices from different brands. It helps you build flexible automations with complex conditions, schedules, and integrations.
- [Basin](https://composio.dev/toolkits/basin) - Basin is a no-code form backend for quickly setting up reliable contact forms. It lets you collect and manage form submissions without writing any server-side code.
- [Bouncer](https://composio.dev/toolkits/bouncer) - Bouncer is an email validation platform that verifies the authenticity of email addresses in real-time and batch. It helps boost deliverability and reduce bounce rates for your communications.
- [Conveyor](https://composio.dev/toolkits/conveyor) - Conveyor is a platform that automates security reviews with a Trust Center and AI-driven questionnaire automation. It streamlines compliance and vendor security processes for faster, hassle-free reviews.
- [Crowdin](https://composio.dev/toolkits/crowdin) - Crowdin is a localization management platform that streamlines translation workflows and collaboration. It helps teams centralize multilingual content, boost productivity, and automate translation processes.
- [Databox](https://composio.dev/toolkits/databox) - Databox is a business analytics platform that connects your data from any tool and device. It helps you track KPIs, build dashboards, and discover actionable insights.
- [Detrack](https://composio.dev/toolkits/detrack) - Detrack is a delivery management platform for real-time tracking and proof of delivery. It helps businesses automate notifications and keep customers updated every step of the way.
- [Dnsfilter](https://composio.dev/toolkits/dnsfilter) - Dnsfilter is a cloud-based DNS security and content filtering solution. It helps organizations block online threats and manage safe internet access with ease.
- [Faraday](https://composio.dev/toolkits/faraday) - Faraday lets you embed AI in workflows across your stack for smarter automation. It boosts your favorite tools with actionable intelligence and seamless integration.
- [Feathery](https://composio.dev/toolkits/feathery) - Feathery is an AI-powered platform for building dynamic data intake forms with advanced logic. It helps teams automate complex workflows and collect structured data with ease.
- [Fillout forms](https://composio.dev/toolkits/fillout_forms) - Fillout forms is an online platform for building and managing forms with a flexible API. It lets you create, distribute, and collect responses from forms with ease.
- [Formdesk](https://composio.dev/toolkits/formdesk) - Formdesk is an online form builder for creating and managing professional forms. It's perfect for collecting data, automating workflows, and integrating form submissions with your favorite services.
- [Formsite](https://composio.dev/toolkits/formsite) - Formsite lets you build online forms and surveys with drag-and-drop simplicity. Capture, manage, and integrate form responses securely for streamlined workflows.
- [Graphhopper](https://composio.dev/toolkits/graphhopper) - GraphHopper is an enterprise-grade Directions API for routing, optimization, and geocoding across multiple vehicle types. It enables fast, reliable route planning and logistics automation for businesses.
- [Hyperbrowser](https://composio.dev/toolkits/hyperbrowser) - Hyperbrowser is a next-generation platform for scalable browser automation. It empowers AI agents to interact with web apps, automate workflows, and handle browser sessions at scale.
- [La Growth Machine](https://composio.dev/toolkits/lagrowthmachine) - La Growth Machine automates multi-channel sales outreach and routine tasks for sales teams. Streamline your workflow and focus on closing more deals.
- [Leverly](https://composio.dev/toolkits/leverly) - Leverly is a workflow automation platform that connects and coordinates actions across your apps. It streamlines repetitive processes so your business runs smoother, faster, and with fewer manual steps.
- [Maintainx](https://composio.dev/toolkits/maintainx) - Maintainx is a cloud-based CMMS for centralizing maintenance data, communication, and workflows. It helps organizations streamline maintenance operations and improve team coordination.
- [Make](https://composio.dev/toolkits/make) - Make is an automation platform that connects your favorite apps and services. Build powerful, custom workflows without writing code.
- [Ntfy](https://composio.dev/toolkits/ntfy) - Ntfy is a notification service to send push messages to phones or desktops. Instantly deliver alerts and updates to users, devices, or teams.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Smtp2go MCP?

With a standalone Smtp2go MCP server, the agents and LLMs can only access a fixed set of Smtp2go tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Smtp2go and many other apps based on the task at hand, all through a single MCP endpoint.

### Can I use Tool Router MCP with Claude Code?

Yes, you can. Claude Code fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Smtp2go tools.

### Can I manage the permissions and scopes for Smtp2go while using Tool Router?

Yes, absolutely. You can configure which Smtp2go scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

### How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Smtp2go data and credentials are handled as safely as possible.

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