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How to connect Mailsoftly to Claude

Connect Claude Web, Desktop and Cowork to Mailsoftly MCP. Verify if your mailsoftly api key is valid, check our company profile details on mailsoftly, and more using natural language, with authentication handled for you.

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Mailsoftly is an intuitive email marketing platform for businesses to create, schedule, and manage campaigns. It makes audience communication easy with automation and user-friendly tools.

20 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 Mailsoftly account to Claude via Composio Connect, enabling it to verify if your Mailsoftly API key is valid, check our company profile details on Mailsoftly, confirm Mailsoftly account credentials before sending 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 Mailsoftly with

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

Connecting Mailsoftly 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 Mailsoftly account

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

For example, ask Claude to:

  • "Verify if your Mailsoftly API key is valid"
  • "Check our company profile details on Mailsoftly"
  • "Confirm Mailsoftly account credentials before sending campaign"

It will prompt you to authenticate and authorize access.

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

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

The Mailsoftly MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mailsoftly account. It provides structured and secure access to your email marketing platform, so your agent can validate credentials, access firm information, and streamline campaign setup for you.

  • API key authentication validation: Have your agent confirm your API key is working and securely connected before taking further actions.
  • Retrieve firm details: Instantly pull details about your Mailsoftly organization to verify account information or tailor campaign strategies.
  • Credential troubleshooting automation: Let your agent proactively diagnose and report authentication issues, making onboarding and integration smoother.
  • Foundational checks for workflow automation: Use the agent to verify Mailsoftly connection status as the first step in building automated campaign flows.

Troubleshooting

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

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

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

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

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

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

3. Why does the Mailsoftly authorization link not work?

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

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

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

The Mailsoftly connection can expire or lose permission.

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

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

Claude can manage the Mailsoftly connection for you.

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

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

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

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

Supported Tools

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

Add Contact to Contact List

Tool to add an existing contact to a specific contact list.

Add Custom Field to Contact

Tool to add a custom field value to an existing contact.

Assign Tags to Contact

Tool to assign multiple tags to an existing contact at once.

Authenticate Firm

Tool to validate the API key and retrieve firm details.

Create Contact

Tool to create a new contact for the authenticated firm with email, first name, and last name.

Create Contact List

Tool to create a new contact list for the authenticated firm.

Create Email Drafts

Tool to create one or more email drafts in Mailsoftly.

Create or Update Contact

Tool to create a new contact or update an existing contact in Mailsoftly.

Get Contact

Tool to retrieve a specific contact by ID from Mailsoftly.

Get Contact Fields

Tool to fetch all contact fields available for a firm, excluding hidden columns.

Get Contact List

Tool to retrieve details of a specific contact list by ID.

Get Contact List Contacts

Tool to retrieve all contacts within a specific contact list.

Get Contact Lists

Tool to retrieve all contact lists for the authenticated firm.

Get Contacts

Tool to retrieve all contacts associated with a firm.

Get Custom Fields

Tool to retrieve all custom fields defined for the authenticated firm.

Get Email Status

Tool to fetch the status of a specific email draft by its ID.

Get Tags

Tool to retrieve all tags associated with the authenticated firm.

Search Contacts

Tool to search for contacts matching specified criteria in Mailsoftly.

Send Email

Tool to send an existing email draft that is marked as ready.

Update Contact

Tool to update an existing contact's information in Mailsoftly.

FRAMEWORKS

How to build Mailsoftly MCP Agent with another framework

Claude Code logo

Claude Code

Use Mailsoftly MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Mailsoftly MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Mailsoftly MCP with Claude Agent SDK

Codex logo

Codex

Use Mailsoftly MCP with Codex

OpenClaw logo

OpenClaw

Use Mailsoftly MCP with OpenClaw

Hermes logo

Hermes

Use Mailsoftly MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Mailsoftly MCP with Atomic Agent

Google ADK logo

Google ADK

Use Mailsoftly MCP with Google ADK

LangChain logo

LangChain

Use Mailsoftly MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Mailsoftly MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Mailsoftly MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Mailsoftly MCP with LlamaIndex

CrewAI logo

CrewAI

Use Mailsoftly MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Mailsoftly MCP with Pydantic AI

AutoGen logo

AutoGen

Use Mailsoftly MCP with AutoGen

FAQ

Frequently asked questions

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

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

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