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How to connect Mailercloud to Claude

Connect Claude Web, Desktop and Cowork to Mailercloud MCP. Send a newsletter to all vip contacts, add a new subscriber to marketing list, and more using natural language, with authentication handled for you.

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Mailercloud is a modern email marketing platform for businesses of all sizes. It makes campaign management and audience growth fast and simple.

6 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Mailercloud account to Claude via Composio Connect, enabling it to send a newsletter to all VIP contacts, add a new subscriber to marketing list, get open rates for last week's campaign, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Mailercloud with

Claude CodeOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Mailercloud to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Mailercloud account

Back in Claude, ask it to connect to Mailercloud or give it any Mailercloud-related task.

For example, ask Claude to:

  • "Send a newsletter to all VIP contacts"
  • "Add a new subscriber to marketing list"
  • "Get open rates for last week's campaign"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Mailercloud account is ready to use.

What is the Mailercloud Claude Connector, and what's possible with it?

The Mailercloud MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mailercloud account. It provides structured and secure access so your agent can perform Mailercloud operations on your behalf.

Troubleshooting

1. Why does Claude not use the Composio connector for Mailercloud?

The connector can show as connected, but Claude must use it in each Mailercloud conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Mailercloud again.

2. Why does Claude show an MCP server error before Mailercloud connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Mailercloud.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Mailercloud.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Mailercloud authorization link not work?

The Composio connector is one server. Your Mailercloud account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Mailercloud connection.
  • Composio creates a fresh Mailercloud authorization link.
  • Open that link in your browser and finish the Mailercloud sign-in.

4. Why do Mailercloud actions fail after they worked before?

The Mailercloud connection can expire or lose permission.

  • Ask Claude to inspect the Mailercloud connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Mailercloud account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Mailercloud.
  • If the action still fails with a permission error, check that the connected account has that permission in Mailercloud itself.

5. How do I switch to a different Mailercloud account?

Claude can manage the Mailercloud connection for you.

  • Ask Claude to disconnect or delete the current Mailercloud account.
  • Ask Claude to connect Mailercloud again.
  • Open the new Composio authorization link for Mailercloud.
  • Sign in with the other Mailercloud account in the browser.
  • After the account connects, ask Claude to retry the Mailercloud task.

6. Why is my Mailercloud connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Mailercloud connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Mailercloud tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Mailercloud.
TOOLS

Supported Tools

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

Create List

Tool to create a new recipient list in Mailercloud for storing and managing contacts.

Create custom property

Create a custom property for contacts in Mailercloud.

Delete Contact Property

Tool to delete a custom contact property by ID.

Get Client Plan

Tool to retrieve client plan information from Mailercloud.

Search Contacts in List

Tool to retrieve contacts in a specific list with pagination.

Update Contact Property

Tool to update a custom property of contacts in Mailercloud.

FRAMEWORKS

How to build Mailercloud MCP Agent with another framework

Claude Code logo

Claude Code

Use Mailercloud MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Mailercloud MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Mailercloud MCP with Claude Agent SDK

Codex logo

Codex

Use Mailercloud MCP with Codex

OpenClaw logo

OpenClaw

Use Mailercloud MCP with OpenClaw

Hermes logo

Hermes

Use Mailercloud MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Mailercloud MCP with Atomic Agent

Google ADK logo

Google ADK

Use Mailercloud MCP with Google ADK

LangChain logo

LangChain

Use Mailercloud MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Mailercloud MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Mailercloud MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Mailercloud MCP with LlamaIndex

CrewAI logo

CrewAI

Use Mailercloud MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Mailercloud MCP with Pydantic AI

AutoGen logo

AutoGen

Use Mailercloud MCP with AutoGen

FAQ

Frequently asked questions

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

Yes, you can. Claude Cowork 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 Mailercloud tools.

Yes, absolutely. You can configure which Mailercloud 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.

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 Mailercloud data and credentials are handled as safely as possible.

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