How to integrate Mailcoach MCP with Codex

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Introduction

Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Mailcoach MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.

Also integrate Mailcoach with

Why use Composio?

Apart from a managed and hosted MCP server, you will get:

  • CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
  • Large tool responses: Handle them to minimise context rot.
  • Dynamic just-in-time access to 20,000 tools across 1000+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.

How to install Mailcoach MCP in Codex

Run the setup command

Run this command in your terminal to add the Composio MCP server to Codex.

Terminal

It will initiate the authentication in a browser window, authorize Codex to access your Composio account.

Composio authentication page

(Optional) Authenticate with OAuth

To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.

bash
codex mcp login composio

Verify the connection

Run codex mcp list to confirm Composio appears as a registered MCP server.

bash
codex mcp list

Codex App

Codex App follows the same approach as VS Code.

  1. Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
  2. Fill the header and Key fields with { "x-consumer-api-key" = "ck_*******" }.
  3. The Key is the Composio API key, that you can find on dashboard.composio.dev
  4. Click on Authenticate and authorize Codex to your Composio account and you're all set.
Codex App MCP setup
  1. Restart and verify if it's there in .codex/config.toml
bash
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }

What is the Mailcoach MCP server, and what's possible with it?

The Mailcoach MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mailcoach account. It provides structured and secure access to your email marketing platform, so your agent can manage campaigns, organize subscriber lists, create templates, and automate email workflows on your behalf.

  • Email campaign creation and scheduling: Direct your agent to launch new campaigns, send emails to specific lists, or set up campaign schedules based on your marketing needs.
  • Subscriber list and segmentation management: Let your agent create new email lists, add or confirm subscribers, and apply tags for better audience segmentation and targeting.
  • Template management and customization: Instruct your agent to create, update, or organize reusable email templates and transactional templates for efficient campaign building.
  • Automated suppression and bounce handling: Have your agent add suppressions for bounced or blocked addresses, keeping your lists clean and compliant with deliverability best practices.
  • Bulk subscriber import and data enrichment: Enable your agent to import subscribers via CSV, append new data to existing imports, and streamline growth of your contact lists.

Supported Tools & Triggers

Tools
Add Mailcoach CampaignTool to create a new Mailcoach campaign.
Add Email ListTool to create a new email list.
Add suppressionTool to add a suppression entry.
Add Tag to Email ListTool to create a new tag within a specific email list.
Add Tags to SubscriberAdd tags to a subscriber for segmentation and targeting.
Add Transactional Email TemplateCreates a new email template in Mailcoach via POST /api/templates.
Append to Subscriber ImportTool to append CSV data to an existing subscriber import.
Confirm SubscriberConfirm a subscriber's subscription to an email list (double opt-in confirmation).
Create Segment for Email ListTool to create a new segment within an email list.
Create Subscriber ImportCreates a new subscriber import in Mailcoach.
Delete CampaignTool to delete a campaign by UUID.
Delete Email ListTool to delete an email list by UUID.
Delete Segment from Email ListTool to delete a segment from an email list.
Delete SubscriberPermanently delete a subscriber by UUID from Mailcoach.
Delete Subscriber ImportTool to delete a subscriber import by its UUID.
Delete SuppressionTool to delete a suppression entry by UUID.
Delete Tag from Email ListTool to delete a tag from an email list.
Delete TemplateTool to delete a template by UUID.
Delete Transactional MailTool to delete a transactional mail send record by its UUID.
Get All CampaignsTool to retrieve all campaigns.
Get All Sent ItemsTool to retrieve all sent items.
Get All Subscriber ImportsTool to retrieve all subscriber imports.
Get All SuppressionsRetrieve a paginated list of all email suppression entries from Mailcoach.
Get All TagsTool to retrieve all tags for a specific email list.
Get All TemplatesTool to retrieve all templates.
Get All Transactional Email TemplatesTool to retrieve all transactional email templates.
Get Campaign BouncesTool to retrieve bounced subscribers of a sent campaign with pagination support.
Get Campaign ClicksTool to retrieve clicks from a sent campaign with pagination support.
Get Campaign OpensTool to retrieve all opens for a sent campaign with pagination support.
Get Campaign UnsubscribesTool to retrieve unsubscribes from a sent campaign with pagination support.
Get Email ListsTool to retrieve all email lists.
Get SegmentTool to retrieve details of a specific segment.
Get Specific CampaignTool to retrieve details of a specific Mailcoach campaign.
Get Specific Email ListRetrieve detailed information about a specific Mailcoach email list by its UUID.
Get Specific SubscriberTool to retrieve a specific subscriber.
Get Specific SuppressionTool to retrieve a specific suppression entry.
Get Specific TagTool to retrieve details of a specific tag.
Get Specific TemplateRetrieves the full details of a specific Mailcoach email template by its UUID.
Get Subscriber ImportTool to retrieve details of a specific subscriber import by UUID.
Get Transactional MailTool to retrieve details of a specific transactional email by its UUID.
Get UserTool to retrieve details of the currently authenticated user.
List SegmentsTool to retrieve all segments for a specific email list.
List SubscribersTool to list all subscribers from a specific email list with pagination support.
List Transactional MailsTool to retrieve all transactional email records.
Remove Tags from SubscriberTool to remove tags from a subscriber.
Resend Subscriber ConfirmationTool to resend confirmation email to a subscriber.
Start Subscriber ImportStarts processing a subscriber import that is in 'draft' status.
Subscribe To Email ListSubscribe (or update) a subscriber to an email list.
Unsubscribe SubscriberUnsubscribe a subscriber from their email list in Mailcoach.
Update CampaignTool to update an existing Mailcoach campaign.
Update Email ListTool to update an existing email list.
Update SegmentTool to update an existing segment within an email list.
Update SubscriberTool to update a subscriber.
Update Subscriber ImportTool to update an existing subscriber import.
Update TagTool to update an existing tag within an email list.
Update TemplateUpdates an existing email template in Mailcoach.

Conclusion

You've successfully integrated Mailcoach with Codex using Composio's MCP server. Now you can interact with Mailcoach directly from your terminal, VS Code, or the Codex App using natural language commands.

Key benefits of this setup:

  • Seamless integration across CLI, VS Code, and standalone app
  • Natural language commands for Mailcoach operations
  • Managed authentication through Composio
  • Access to 20,000+ tools across 1000+ apps for cross-app workflows
  • CodeAct workbench for complex tool chaining

Next steps:

  • Try asking Codex to perform various Mailcoach operations
  • Explore cross-app workflows by connecting more toolkits
  • Build automation scripts that leverage Codex's AI capabilities

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FAQ

What are the differences in Tool Router MCP and Mailcoach MCP?

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

Can I use Tool Router MCP with Codex?

Yes, you can. Codex 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 Mailcoach tools.

Can I manage the permissions and scopes for Mailcoach while using Tool Router?

Yes, absolutely. You can configure which Mailcoach 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.

How safe is my data with Composio Tool Router?

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 Mailcoach data and credentials are handled as safely as possible.

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