# How to connect mailfloss with ChatGPT

```json
{
  "title": "How to connect mailfloss with ChatGPT",
  "toolkit": "mailfloss",
  "toolkit_slug": "mailfloss",
  "framework": "ChatGPT",
  "framework_slug": "chatgpt",
  "url": "https://composio.dev/toolkits/mailfloss/framework/chatgpt",
  "markdown_url": "https://composio.dev/toolkits/mailfloss/framework/chatgpt.md",
  "updated_at": "2026-10-24T05:33:40.713Z"
}
```

## Introduction

### How to connect mailfloss MCP with ChatGPT
[ChatGPT](https://chatgpt.com/) can take action across your apps and files, stay with a project for hours, and turn a goal into finished materials like sheets, slides, and docs, not just answers.
In this guide, I will explain the easiest and most secure way to connect your mailfloss account to ChatGPT via Composio Connect, so it can verify email addresses, submit verification batches, track job status, and review results through natural language commands without ever putting your account credentials at risk.

## Also integrate mailfloss with

- [Claude Cowork](https://composio.dev/toolkits/mailfloss/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/mailfloss/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/mailfloss/framework/atomic-agent)

## TL;DR

### Why use Composio over default connectors?
- Apps with read and write access. Default connectors mostly can read your data. Composio's mailfloss integration lets ChatGPT take actions like creating drafts, sending updates, labeling records, and more.
- 1,500+ SaaS toolkits out of the box. Composio gives you instant access to a vast catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
- One MCP server for every app. Connect any of your applications on demand through a single endpoint, rather than juggling a separate server for each app.
- Smart, context-aware tool loading. Unlike traditional MCP servers that dump every available tool into the LLM context window, Composio searches for and loads only the tools relevant to the task at hand.
- Cross-app automation. Chain actions across multiple apps in a single run - fetch a thread, summarize it in Notion, and post highlights to Slack without leaving the conversation.

## Connect mailfloss to ChatGPT

### Prerequisites
- A ChatGPT account. We will use the [ChatGPT desktop app](https://openai.com/chatgpt/download/), and the steps are the same on the web.
- Access to the mailfloss workspace you want to connect.
- [Composio plugin](https://dashboard.composio.dev/login?utm_source=toolkits&utm_medium=framework_template&utm_campaign=chatgpt&utm_content=composio_connect&next=%2F~%2Forg%2Fconnect%2Fclients%2Fchatgpt).
Note: Composio connects through OAuth. You will be asked to sign in and approve specific permissions. Review the permission screen carefully if you are using a work account.
### Step-by-step: Connect mailfloss to ChatGPT
### 1. Install the Composio plugin
Click the button. ChatGPT opens the Composio plugin page. Click Install plugin.
[Install in ChatGPT](https://chatgpt.com/plugins/plugin_asdk_app_6a58503580c08191b78cc5bdaf4eba6e)
You can also find it inside ChatGPT: go to Settings, open Plugins, search the marketplace for Composio, and click Install plugin.
### 2. Authenticate
After you install, ChatGPT asks you to authenticate with Composio. Log in and click Allow access to authorize ChatGPT to use your Composio account.
### 3. Start using Composio
That is it. Composio tools are now available in ChatGPT. Type @Composio followed by your request, for example @Composio find unread mailfloss messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize mailfloss.
### Option 2: Add Composio as an MCP server
If you cannot use the plugin marketplace, add Composio as a custom MCP server instead.
### 1. Open the MCP settings
In ChatGPT, go to Settings and open the Plugins section. Inside the Plugins page, click the MCP tab.
### 2. Add the server
Click Add server. In the Name field enter Composio, for Type select Streamable HTTP, and in the URL field paste the Composio MCP server URL:

```bash
https://connect.composio.dev/mcp
```

## 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.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `MAILFLOSS_CANCEL_BATCH_VERIFICATION` | Cancel Batch Verification | Cancel a pending or in-progress batch verification job. This irreversible operation stops remaining work and re-credits unprocessed emails; it is a no-op if the job has already completed. Composio generates an idempotency key when omitted and preserves it for retries within this execution. Reuse a caller-supplied key for the same cancellation across separate calls. |
| `MAILFLOSS_CHECK_API_KEY` | Check API Key | Verify that the connected Mailfloss API key is valid. Uses the connection's Bearer credential and does not accept credentials, request widget tokens, or return signed-proof fields. |
| `MAILFLOSS_CREATE_BATCH_VERIFICATION` | Create Batch Verification | Submit email addresses for asynchronous batch verification and return the job ID. Optionally request a completion webhook instead of polling. This billable action can fail with 402 insufficient_credits. Composio generates an idempotency key when none is supplied, so internal retries reuse the same key and email list. Separate action calls replay the cached response only when the caller reuses that key with identical emails; changing the list fails with 422, while a concurrent same-key request can fail with 409. |
| `MAILFLOSS_ERASE_VERIFICATION_RECORDS` | Erase Verification Records | Permanently erase stored verification records for the supplied email addresses. This destructive data-privacy operation is irreversible; erased records cannot be recovered. Addresses with no stored records are a successful no-op. The body contains only the documented emails array. Composio generates an idempotency key when omitted and preserves it for retries within this execution. |
| `MAILFLOSS_GET_ACCOUNT` | Get Account | Return the authenticated Mailfloss account holder's identity, contact details, security posture, notification preferences, and signup time. This read does not expose API credentials or two-factor secrets. |
| `MAILFLOSS_GET_BATCH_VERIFICATION_RESULTS` | Get Batch Verification Results | Return one cursor-controlled page of stored batch results after organization floss-setting overrides. These statuses and reasons can differ from Verify Email's raw verdict for the same address; fetching stored results is not documented as consuming verification credits. |
| `MAILFLOSS_GET_BATCH_VERIFICATION_STATUS` | Get Batch Verification Status | Read an asynchronous batch verification job's state and available counters. Polling is not documented as consuming verification credits; authentication, policy, not-found, rate-limit, and server responses remain errors rather than job states. |
| `MAILFLOSS_GET_JOB` | Get Verification Job | Return one verification job and its complete verdict breakdown. Results are null until completion and include all per-reason counters when present. |
| `MAILFLOSS_GET_ORGANIZATION` | Get Organization | Return the authenticated Mailfloss organization's plan, credit balances, current-period usage, trial state, account status, and feature entitlements. This is a read-only view and does not expose API or billing credentials. |
| `MAILFLOSS_GET_USAGE_REPORT` | Get Usage Report | Return verification usage for a UTC calendar period, optionally scoped to one ESP connection. Lifetime reports contain only the authoritative total; their range, status counts, and reason counts are null. |
| `MAILFLOSS_LIST_JOBS` | List Verification Jobs | Return one page of the organization's verification-job history, newest first, with optional source and lifecycle filters. Completed jobs include verdict totals; use Get Job for the full per-reason breakdown. |
| `MAILFLOSS_VERIFY_EMAIL` | Verify Email | Verify one email address and return Mailfloss's raw engine verdict without organization floss-setting overrides. passed means safe to send, undeliverable is a hard failure, risky covers role, disposable, bounced, or complained addresses, and unknown includes accept-all addresses and transient SMTP failures. relay and gibberish are annotations and do not alter the verdict. Each successful call consumes one verification credit; a depleted balance fails with 402 insufficient_credits, so do not retry billable failures blindly. |

## Supported Triggers

None listed.

## Creating MCP Server - Stand-alone vs Composio SDK

Once connected, ChatGPT can access the mailfloss MCP server via Composio to run actions that you authorize, directly in your workspace.

## Complete Code

None listed.

## How to build mailfloss MCP Agent with another framework

- [Claude Cowork](https://composio.dev/toolkits/mailfloss/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/mailfloss/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/mailfloss/framework/atomic-agent)

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## Frequently Asked Questions

### What are the differences in Tool Router MCP and mailfloss MCP?

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.

### Can I use Tool Router MCP with ChatGPT?

Yes, you can. ChatGPT 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.

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

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.

### 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 mailfloss data and credentials are handled as safely as possible.

---
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