How do I find my Maileon API Key?

Log in to your Maileon account and navigate to Settings > API to generate and copy your unique REST API Key.

What is the difference between a Mailing and a Campaign?

In Maileon terminology, a 'Mailing' refers to a specific email send-out, which is the standard entity managed via the campaigns tools in this server.

Can I filter contacts by specific attributes?

Yes, you can provide filtering strings in the `params` field of the `list_account_contacts` tool following the Maileon query syntax.

Maileon MCP Server for LangChain 9 tools — connect in under 2 minutes

Name: Maileon
Availability: InStock
Author: Vinkius

python.langchain.com/docs/integrations/tools/mcp

Built by Vinkius GDPR 9 Tools Framework

LangChain is the leading Python framework for composable LLM applications. Connect Maileon through Vinkius and LangChain agents can call every tool natively. combine them with retrievers, memory, and output parsers for sophisticated AI pipelines.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

import asyncio
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent

async def main():
    # Your Vinkius token. get it at cloud.vinkius.com
    async with MultiServerMCPClient({
        "maileon": {
            "transport": "streamable_http",
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
        }
    }) as client:
        tools = client.get_tools()
        agent = create_react_agent(
            ChatOpenAI(model="gpt-4o"),
            tools,
        )
        response = await agent.ainvoke({
            "messages": [{
                "role": "user",
                "content": "Using Maileon, show me what tools are available.",
            }]
        })
        print(response["messages"][-1].content)

asyncio.run(main())

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* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Maileon MCP Server

Connect your Maileon account to any AI agent to automate your professional email marketing and audience management. This MCP server enables your agent to manage subscribers, control mailing lifecycles, and retrieve detailed performance statistics directly from natural language interfaces.

LangChain's ecosystem of 500+ components combines seamlessly with Maileon through native MCP adapters. Connect 9 tools via Vinkius and use ReAct agents, Plan-and-Execute strategies, or custom agent architectures. with LangSmith tracing giving full visibility into every tool call, latency, and token cost.

What you can do

Contact Management — List all subscribers, retrieve complete profiles by email, and manage opt-ins and opt-outs
Mailing Control — Monitor your email campaigns (mailings), retrieve metadata, and trigger official dispatches when ready
Real-time Reporting — Retrieve KPIs and statistics for individual mailings, including opens, clicks, and bounces
Audience Hygiene — Monitor unsubscription events and permanently remove contacts to maintain list quality
Data Ingestion — Create and update subscriber records programmatically to sync with your external CRMs

The Maileon MCP Server exposes 9 tools through the Vinkius. Connect it to LangChain in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Maileon to LangChain via MCP

Follow these steps to integrate the Maileon MCP Server with LangChain.

Install dependencies

Run pip install langchain langchain-mcp-adapters langgraph langchain-openai

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Run the agent

Save the code and run python agent.py

Explore tools

The agent discovers 9 tools from Maileon via MCP

Why Use LangChain with the Maileon MCP Server

LangChain provides unique advantages when paired with Maileon through the Model Context Protocol.

The largest ecosystem of integrations, chains, and agents. combine Maileon MCP tools with 500+ LangChain components

Agent architecture supports ReAct, Plan-and-Execute, and custom strategies with full MCP tool access at every step

LangSmith tracing gives you complete visibility into tool calls, latencies, and token usage for production debugging

Memory and conversation persistence let agents maintain context across Maileon queries for multi-turn workflows

Maileon + LangChain Use Cases

Practical scenarios where LangChain combined with the Maileon MCP Server delivers measurable value.

RAG with live data: combine Maileon tool results with vector store retrievals for answers grounded in both real-time and historical data

Autonomous research agents: LangChain agents query Maileon, synthesize findings, and generate comprehensive research reports

Multi-tool orchestration: chain Maileon tools with web scrapers, databases, and calculators in a single agent run

Production monitoring: use LangSmith to trace every Maileon tool call, measure latency, and optimize your agent's performance

Maileon MCP Tools for LangChain (9)

These 9 tools become available when you connect Maileon to LangChain via MCP:

create_new_contact

Can trigger a Double Opt-In process if configured. Add or update a contact in the database

delete_account_contact

Remove a contact from the account

dispatch_email_mailing

The mailing must be in a ready state. Trigger the dispatch of a mailing

get_contact_by_email

Get details for a specific contact

get_mailing_details

Get details for a specific mailing

get_mailing_statistics

Get performance statistics for a mailing

list_account_contacts

Use optional params for filtering. List all contacts in the Maileon account

list_email_mailings

Use optional params to filter by state (e.g., "state=draft"). List all mailings (campaigns)

list_unsubscription_events

List recent unsubscription events

Example Prompts for Maileon in LangChain

Ready-to-use prompts you can give your LangChain agent to start working with Maileon immediately.

"List all active mailings in my Maileon account."

"Get the latest statistics for mailing ID '12345'."

"Add 'new-user@example.com' to my Maileon contacts."

Troubleshooting Maileon MCP Server with LangChain

Common issues when connecting Maileon to LangChain through the Vinkius, and how to resolve them.

MultiServerMCPClient not found

Install: pip install langchain-mcp-adapters

Maileon + LangChain FAQ

Common questions about integrating Maileon MCP Server with LangChain.

How does LangChain connect to MCP servers?

Use langchain-mcp-adapters to create an MCP client. LangChain discovers all tools and wraps them as native LangChain tools compatible with any agent type.

Which LangChain agent types work with MCP?

All agent types including ReAct, OpenAI Functions, and custom agents work with MCP tools. The tools appear as standard LangChain tools after the adapter wraps them.