How to connect Mailbluster to Claude

Connect Claude Web, Desktop and Cowork to Mailbluster MCP. Add new lead with email and name, list all products in your catalog, and more using natural language, with authentication handled for you.

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MailBluster is a robust, cost-effective email marketing platform for sending personalized campaigns at scale. It helps businesses engage audiences with reliable delivery and advanced segmentation.

15 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 Mailbluster account to Claude via Composio Connect, enabling it to add new lead with email and name, list all products in your catalog, get details for recent order by ID, 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.

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Connecting Mailbluster to Claude Web, Desktop, and Cowork

1. Open Customize

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

2. Add the Composio MCP server

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

3. 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

4. Connect your Mailbluster account

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

For example, ask Claude to:

  • "Add new lead with email and name"
  • "List all products in your catalog"
  • "Get details for recent order by ID"

It will prompt you to authenticate and authorize access.

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

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

The Mailbluster MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mailbluster account. It provides structured and secure access to your email marketing tools and data, so your agent can perform actions like creating leads, managing products, processing orders, and listing campaign resources on your behalf.

  • Lead creation and management: Seamlessly add new leads to your Mailbluster campaigns with just an agent prompt, ensuring your audience list stays up to date.
  • Product catalog management: Let your agent create, retrieve, list, or delete products in your Mailbluster catalog, making it easy to manage what you promote via email.
  • Order processing and tracking: Automatically create, fetch, list, or delete orders, so you always have up-to-date insights into campaign transactions and purchases.
  • Custom field discovery: Easily retrieve all custom fields defined in your Mailbluster account, helping your agent personalize emails or segment audiences with precision.
  • Bulk resource listing: Quickly list all products or orders with advanced filtering, sorting, and pagination, empowering your agent to generate tailored campaign reports or summaries.

Troubleshooting

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

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

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

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

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

  • 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 Mailbluster.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Mailbluster authorization link not work?

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

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

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

The Mailbluster connection can expire or lose permission.

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

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

Claude can manage the Mailbluster connection for you.

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

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

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

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click and click Clear cache.
  • If Mailbluster 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 Mailbluster.
TOOLS

Supported Tools

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

Create MailBluster Lead

Tool to create a new lead in MailBluster.

Create Order

Tool to create a new order in MailBluster.

Create Product

Tool to create a new product in MailBluster.

Delete MailBluster Lead

Tool to delete a lead by lead email hash.

Delete Order

Tool to delete a specific order.

Delete Mailbluster Product

Tool to delete a product.

Get Lead

Tool to retrieve a specific lead's information using their lead hash (MD5 encrypted email address).

Get Order

Tool to retrieve details of a specific order.

Get Product

Tool to retrieve details of a specific product.

List Fields

Tool to list all custom fields.

List Orders

Tool to list all orders.

List Products

Tool to list all products.

Update MailBluster Lead

Tool to update an existing lead's information in MailBluster.

Update Order

Tool to update an existing order's customer details, currency, price, and items in MailBluster.

MailBluster Update Product

Tool to update a product in MailBluster by its ID.

FAQ

Frequently asked questions

With a standalone Mailbluster MCP server, the agents and LLMs can only access a fixed set of Mailbluster tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Mailbluster 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 Mailbluster tools.

Yes, absolutely. You can configure which Mailbluster 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 Mailbluster data and credentials are handled as safely as possible.

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