Mailbluster MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Mailbluster MCP or direct API to send campaigns, manage subscribers, segment lists, and track email performance through natural language.

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Api Key

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

Try Mailbluster now

Type what you want done — sign in and watch it run live in the Tool Router playground.

TOOL ROUTER PLAYGROUND
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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.

SETUP GUIDE

Connect Mailbluster MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
Install the Composio SDK and your agent framework
2

Create a session with MCP enabled

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

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["mailbluster"],
  mcp: true,
});
Create a session scoped to Mailbluster and read its MCP URL and headers
3

Connect your agent to the MCP server

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: "Add a new lead with email and name",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
Pass the session's MCP URL and headers to your agent and run a Mailbluster request
SETUP GUIDE

Connect Mailbluster API Tool with your Agent

1

Install Composio

typescript
npm install @composio/core @composio/openai openai
Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
2

Create a Composio session

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: ["mailbluster"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to Mailbluster
3

Run Mailbluster tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Add a new lead with email and name" }],
});

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);
Send a request, execute the Mailbluster tool calls through the session, and print the final answer

Why Use Composio?

AI Native Mailbluster Integration

  • Supports both Mailbluster MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for sending campaigns, managing lists, and tracking results

Managed Auth

  • Built-in API key handling with secure storage and rotation
  • Central place to manage, scope, and revoke Mailbluster access
  • Per user and per environment credentials instead of hard-coded keys

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Comprehensive execution logs so you always know what ran, when, and on whose behalf

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access Mailbluster
  • Scoped, least privilege access to Mailbluster resources
  • Full audit trail of agent actions to support review and compliance

Rolling this out across your team?

Give your team centralized access control across every framework with Composio’s MCP Gateway.

EXPLORE MCP GATEWAY
FAQ

Frequently asked questions

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

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your Mailbluster connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

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

Create the key in your Mailbluster account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the Mailbluster actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside Mailbluster at any time.

When you connect a Mailbluster account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in Mailbluster as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside Mailbluster. If Mailbluster lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside Mailbluster at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each Mailbluster connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

The connection stops working the moment Mailbluster rejects the old key. Create a new key in Mailbluster and reconnect the account from the Composio dashboard or by asking your agent to reconnect Mailbluster. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal Mailbluster use. Paid plans add higher limits and team features. Your Mailbluster plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple Mailbluster accounts).

With Composio, you connect Mailbluster once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

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