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How to connect Smtp2go to Claude

Connect Claude Web, Desktop and Cowork to Smtp2go MCP. Search for bounced emails this week, add marketing@mydomain.com as allowed sender, and more using natural language, with authentication handled for you.

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Smtp2go is a dependable email delivery service that ensures your messages are sent and received reliably. It's designed to give your business fast, secure, and hassle-free transactional email delivery.

32 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 Smtp2go account to Claude via Composio Connect, enabling it to search for bounced emails this week, add marketing@mydomain.com as allowed sender, list all verified sender domains, 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 Smtp2go with

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Connecting Smtp2go 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 Smtp2go account

Back in Claude, ask it to connect to Smtp2go or give it any Smtp2go-related task.

For example, ask Claude to:

  • "Search for bounced emails this week"
  • "Add marketing@mydomain.com as allowed sender"
  • "List all verified sender domains"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Smtp2go account is ready to use.

What is the Smtp2go Claude Connector, and what's possible with it?

The Smtp2go MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Smtp2go account. It provides structured and secure access to your email sending and management infrastructure, so your agent can perform actions like searching email activity, managing allowed senders, updating sender domains, and controlling IP allow lists on your behalf.

  • Comprehensive email activity search: Ask your agent to filter and retrieve email events such as sends, opens, clicks, and bounces by recipient, date, or message ID.
  • Allowed sender management: Have your agent add, update, remove, or view allowed sender email addresses to control who can send emails from your account.
  • Sender domain configuration: Let the agent register new sender domains for SPF/DKIM verification and manage domain-related settings seamlessly.
  • IP allow list control: Direct your agent to add or remove IP addresses or CIDR ranges in your account’s IP allow list, enhancing security for sending sources.
  • Email delivery monitoring: Enable your agent to search and analyze sent emails, helping you monitor delivery, troubleshoot issues, and ensure reliable communication.

Troubleshooting

1. Why does Claude not use the Composio connector for Smtp2go?

The connector can show as connected, but Claude must use it in each Smtp2go conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Smtp2go again.

2. Why does Claude show an MCP server error before Smtp2go connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Smtp2go.

  • 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 Smtp2go.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Smtp2go authorization link not work?

The Composio connector is one server. Your Smtp2go account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Smtp2go connection.
  • Composio creates a fresh Smtp2go authorization link.
  • Open that link in your browser and finish the Smtp2go sign-in.

4. Why do Smtp2go actions fail after they worked before?

The Smtp2go connection can expire or lose permission.

  • Ask Claude to inspect the Smtp2go connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Smtp2go account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Smtp2go.
  • If the action still fails with a permission error, check that the connected account has that permission in Smtp2go itself.

5. How do I switch to a different Smtp2go account?

Claude can manage the Smtp2go connection for you.

  • Ask Claude to disconnect or delete the current Smtp2go account.
  • Ask Claude to connect Smtp2go again.
  • Open the new Composio authorization link for Smtp2go.
  • Sign in with the other Smtp2go account in the browser.
  • After the account connects, ask Claude to retry the Smtp2go task.

6. Why is my Smtp2go connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Smtp2go connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Smtp2go 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 Smtp2go.
TOOLS

Supported Tools

Every Smtp2go action and event your agent gets out of the box.

Search Email Activity

Tool to search activity events like sends, opens, clicks, and bounces.

Add Allowed Sender

Tool to add a new allowed sender email address.

Remove Allowed Sender

Tool to remove a sender email address from the allowed senders list.

Update Allowed Senders

Tool to update (replace) the entire allowed senders list in your SMTP2GO account.

View Allowed Senders

Tool to view the list of allowed senders configured in your account.

Add Sender Domain

Tool to add a new sender domain for SPF/DKIM verification.

Search SMTP2GO Emails

Tool to search sent emails.

Add IP Allow List

Tool to add a public IP address to your account's IP allow list.

Remove IP from Allow List

Tool to remove an IP address from your account's IP allow list.

View IP Allow List

Tool to view the list of IP addresses in your IP allow list.

View Received SMS

Tool to retrieve received SMS replies for your SMTP2GO account.

Get Email Bounces Stats

Tool to retrieve email bounces statistics.

Email Cycle Statistics

Tool to retrieve current email cycle/quota statistics.

Email History Statistics

Tool to retrieve email history statistics.

Email Spam Statistics

Tool to retrieve email spam report statistics.

Email Unsubscription Stats

Tool to retrieve email unsubscribe statistics.

Search Subaccounts

Tool to search subaccounts.

Subaccounts Usage

Tool to retrieve usage statistics for subaccounts.

Add to Suppression List

Tool to add email addresses or domains to the suppression list.

Remove suppression entry

Tool to remove an email address or domain from the suppression list.

View Suppression List

Tool to view the suppression list.

Edit Email Template

Tool to edit details of an existing email template.

Search Email Templates

Tool to search your collection of email templates by ID or name.

View Email Template

Tool to view details of a specific email template.

Add SMTP User

Tool to add a new SMTP user.

Edit SMTP User

Tool to edit details of an existing SMTP user.

Remove SMTP User

Tool to remove an SMTP user from your account.

View SMTP Users

Tool to list all SMTP users configured on your account.

Add Webhook

Tool to create a new webhook.

Edit Webhook

Tool to edit an existing webhook’s settings.

Remove webhook

Tool to remove a webhook.

View Webhooks

Tool to view all webhooks configured in your account.

FRAMEWORKS

How to build Smtp2go MCP Agent with another framework

Claude Code logo

Claude Code

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OpenAI Agents SDK logo

OpenAI Agents SDK

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Claude Agent SDK logo

Claude Agent SDK

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Codex logo

Codex

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OpenClaw logo

OpenClaw

Use Smtp2go MCP with OpenClaw

Hermes logo

Hermes

Use Smtp2go MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Smtp2go MCP with Atomic Agent

Google ADK logo

Google ADK

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LangChain logo

LangChain

Use Smtp2go MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Smtp2go MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Smtp2go MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Smtp2go MCP with LlamaIndex

CrewAI logo

CrewAI

Use Smtp2go MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Smtp2go MCP with Pydantic AI

AutoGen logo

AutoGen

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FAQ

Frequently asked questions

With a standalone Smtp2go MCP server, the agents and LLMs can only access a fixed set of Smtp2go tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Smtp2go 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 Smtp2go tools.

Yes, absolutely. You can configure which Smtp2go 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 Smtp2go data and credentials are handled as safely as possible.

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