How to integrate Smtp2go MCP with Hermes

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Introduction

Hermes is a 24/7 autonomous agent that lives on your computer or server — it remembers what it learns and evolves as your usage grows.

This guide explains the easiest and most robust way to connect your Smtp2go account to Hermes. You can do this through either Composio Connect CLI or Composio Connect MCP. For personal use we recommend the CLI, but you won't go wrong with MCP either.

Also integrate Smtp2go with

What is Composio Connect?

Composio Connect is a consumer offering that lets anyone plug 1,000+ applications directly into their agent harness — including Hermes. It can:

  • Search and load tools from relevant toolkits on-demand, reducing context usage.
  • Chain multiple tools to accomplish complex workflows via a remote workbench, without excessive back-and-forth with the LLM.
  • Manage app authentication end-to-end with zero manual overhead.

Integrating Smtp2go with Hermes

Using Composio Connect CLI

1. Install the Composio CLI

Run the install script directly, or paste https://composio.dev/hermes into your Hermes chat box to have it installed for you.

bash
curl -fsSL https://composio.dev/install | bash
Hermes authenticating with Composio

2. Authenticate

Once the CLI is installed, ask Hermes to authenticate with Composio.

3. Connect to Smtp2go

Ask your agent to connect to Smtp2go, or simply request any Smtp2go-related task. Hermes will prompt you to authenticate and authorize access.

4. Done. You're all set with a new Smtp2go connection.

Using Composio Connect MCP

1. Get your MCP URL and API Key

Go to dashboard.composio.dev and copy your Connect MCP URL and API key.

Copy MCP URL and API key from Composio dashboard

2. Open the Hermes config file

bash
nano ~/.hermes/config.yaml

3. Add the Composio Connect MCP server

bash
mcp_servers:
  composio:
    url: "https://connect.composio.dev/mcp"
    headers:
      x-consumer-api-key: "YOUR_COMPOSIO_API_KEY"
    connect_timeout: 60
    timeout: 180

Save with Ctrl + O, Enter, then exit with Ctrl + X.

4. Restart your Hermes agent

Once restarted, ask your agent to connect to Smtp2go or request any Smtp2go-related task. It will prompt you to authenticate and authorize access.

5. Done!

What is the Smtp2go MCP server, 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.

Supported Tools & Triggers

Tools
Search Email ActivityTool to search activity events like sends, opens, clicks, and bounces.
Add Allowed SenderTool to add a new allowed sender email address.
Remove Allowed SenderTool to remove a sender email address from the allowed senders list.
Update Allowed SenderTool to update details of an existing allowed sender.
View Allowed SendersTool to view the list of allowed senders configured in your account.
Add Sender DomainTool to add a new sender domain for spf/dkim verification.
Search SMTP2GO EmailsTool to search sent emails.
Add IP Allow ListTool to add an ip address or cidr range to your account’s ip allow list.
Remove IP from Allow ListTool to remove an ip address from your account's ip allow list.
View IP Allow ListTool to view the list of ip addresses in your ip allow list.
View Received SMSTool to retrieve received sms replies for your smtp2go account.
Get Email Bounces StatsTool to retrieve email bounces statistics.
Email Cycle StatisticsTool to retrieve email cycle statistics.
Email History StatisticsTool to retrieve email history statistics.
Email Spam StatisticsTool to retrieve email spam report statistics.
Email Unsubscription StatsTool to retrieve email unsubscribe statistics.
Search SubaccountsTool to search subaccounts.
Subaccounts UsageTool to retrieve usage statistics for subaccounts.
Add to Suppression ListTool to add email addresses or domains to the suppression list.
Remove suppression entryTool to remove an email address or domain from the suppression list.
View Suppression ListTool to view the suppression list.
Edit Email TemplateTool to edit details of an existing email template.
Search Email TemplatesTool to search your collection of email templates by id or name.
View Email TemplateTool to view details of a specific email template.
Add SMTP UserTool to add a new smtp user.
Edit SMTP UserTool to edit details of an existing smtp user.
Remove SMTP UserTool to remove an smtp user from your account.
View SMTP UsersTool to list all smtp users configured on your account.
Add WebhookTool to create a new webhook.
Edit WebhookTool to edit an existing webhook’s settings.
Remove webhookTool to remove a webhook.
View WebhooksTool to view all webhooks configured in your account.

Way Forward

With Smtp2go connected, Hermes can now act on your behalf whenever it detects a relevant task or you ask it to.

From here, you can extend Hermes further:

  • Connect more apps: Calendar, Slack, Notion, Linear, and hundreds of others are available through the same Composio Connect setup. Each new integration compounds what Hermes can do for you.
  • Build workflows across tools: Once multiple apps are connected, Hermes can chain actions together — turn an email into a calendar invite, a Slack message into a Linear ticket, or a meeting note into a follow-up draft.
  • Let it learn your patterns: The more you use Hermes, the better it gets at anticipating how you'd handle recurring tasks. Give it feedback on drafts and decisions, and it will adapt.

If you run into trouble or want to share what you've built, join the community or check out the Docs for deeper configuration options.

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FAQ

What are the differences in Tool Router MCP and Smtp2go MCP?

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.

Can I use Tool Router MCP with Hermes?

Yes, you can. Hermes 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.

Can I manage the permissions and scopes for Smtp2go while using Tool Router?

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.

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 Smtp2go data and credentials are handled as safely as possible.

Used by agents from

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Context
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HubSpot
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