SIGN UPLOG IN
X (Twitter)LinkedInGitHubDiscordYouTube

How to integrate mailfloss MCP with Hermes

Connect Hermes to mailfloss MCP. Verify a single customer email address, check a batch of imported contacts, and more using natural language, with authentication handled for you.

Get started for freeGet a demo
mailfloss logomailfloss
Api Key

mailfloss is an email verification service with APIs for checking addresses and processing verification batches. It helps teams reduce invalid contacts and keep email lists clean.

12 Tools

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 mailfloss 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 mailfloss with

ChatGPTClaude CoworkAtomic Agent

What is Composio Connect?

Composio Connect is a consumer offering that lets anyone plug 1,500+ 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 mailfloss 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 mailfloss

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

4. Done. You're all set with a new mailfloss 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 mailfloss or request any mailfloss-related task. It will prompt you to authenticate and authorize access.

5. Done!

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

The mailfloss MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your mailfloss account. It provides structured and secure access to email verification, batch processing, account details, and usage information, so your agent can verify email addresses, process verification batches, track job status and results, and manage stored verification records on your behalf.

  • Individual email verification: Have your agent check an email address and return its Mailfloss verification verdict.
  • Batch verification workflows: Direct your agent to submit groups of email addresses for verification, monitor processing status, retrieve results, or cancel pending jobs.
  • Verification history: Let the agent review past verification jobs, inspect their verdict breakdowns, and filter job history by source or lifecycle status.
  • Account and usage insights: Instruct your agent to check the connected API key, view account and organization details, and review verification usage for a selected period.
  • Record management: Have your agent permanently erase stored verification records for specified email addresses when they are no longer needed.

Way Forward

With mailfloss 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.

TOOLS

Supported Tools

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

Cancel Batch Verification

Cancel a pending or in-progress batch verification job.

Check API Key

Verify that the connected Mailfloss API key is valid.

Create Batch Verification

Submit email addresses for asynchronous batch verification and return the job ID.

Erase Verification Records

Permanently erase stored verification records for the supplied email addresses.

Get Account

Return the authenticated Mailfloss account holder's identity, contact details, security posture, notification preferences, and signup time.

Get Batch Verification Results

Return one cursor-controlled page of stored batch results after organization floss-setting overrides.

Get Batch Verification Status

Read an asynchronous batch verification job's state and available counters.

Get Verification Job

Return one verification job and its complete verdict breakdown.

Get Organization

Return the authenticated Mailfloss organization's plan, credit balances, current-period usage, trial state, account status, and feature entitlements.

Get Usage Report

Return verification usage for a UTC calendar period, optionally scoped to one ESP connection.

List Verification Jobs

Return one page of the organization's verification-job history, newest first, with optional source and lifecycle filters.

Verify Email

Verify one email address and return Mailfloss's raw engine verdict without organization floss-setting overrides.

FRAMEWORKS

How to build mailfloss MCP Agent with another framework

ChatGPT logo

ChatGPT

Use mailfloss MCP with ChatGPT

Claude Cowork logo

Claude Cowork

Use mailfloss MCP with Claude Cowork

Atomic Agent logo

Atomic Agent

Use mailfloss MCP with Atomic Agent

FAQ

Frequently asked questions

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

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 mailfloss tools.

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

Start with mailfloss.It takes 30 seconds.

Managed auth, hosted MCP servers, and every mailfloss tool your agent needs.Free to start.

Start building