# How to connect SMTPing with ChatGPT

```json
{
  "title": "How to connect SMTPing with ChatGPT",
  "toolkit": "SMTPing",
  "toolkit_slug": "smtping",
  "framework": "ChatGPT",
  "framework_slug": "chatgpt",
  "url": "https://composio.dev/toolkits/smtping/framework/chatgpt",
  "markdown_url": "https://composio.dev/toolkits/smtping/framework/chatgpt.md",
  "updated_at": "2026-11-06T05:32:27.147Z"
}
```

## Introduction

### How to connect SMTPing 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 SMTPing account to ChatGPT via Composio Connect, so it can verify email addresses, check threat lists, inspect your credits, and review usage through natural language commands without ever putting your account credentials at risk.

## Also integrate SMTPing with

- [Claude Cowork](https://composio.dev/toolkits/smtping/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/smtping/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/smtping/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 SMTPing 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 SMTPing 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 SMTPing 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 SMTPing 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 SMTPing messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize SMTPing.
### 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 SMTPing MCP server, and what's possible with it?

The SMTPing MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your SMTPing account. It provides structured and secure access to email verification, threat-list checks, bulk jobs, credits, and usage data, so your agent can verify addresses, identify risky emails, process large lists, monitor credits, and review API usage on your behalf.
- Email address verification: Have your agent verify individual email addresses and review their deliverability status and domain flags.
- Threat-list screening: Direct your agent to check an email or a batch of up to 1,000 addresses against a selected SMTPing threat list.
- Bulk email processing: Instruct your agent to start large verification or threat-list jobs for up to 100,000 addresses, then check progress and retrieve the results.
- Risk and domain flag checks: Let the agent inspect all six SMTPing risk and domain flags for a specific email address.
- Credits and usage tracking: Have your agent check remaining credits, review aggregate usage, list recent API requests, or export usage history as a CSV file.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `SMTPING_CHECK_EMAIL` | Check Email | Check one email address against one selected SMTPing threat list and report whether it matched. Consumes one credit; SMTPing limits synchronous calls to 10 per minute. |
| `SMTPING_CHECK_EMAIL_BATCH` | Check Email Batch | Synchronously check 1 to 1,000 email addresses against one selected SMTPing threat list and return all results. Consumes one credit per unique address; SMTPing limits synchronous calls to 10 per minute. |
| `SMTPING_CHECK_EMAIL_FLAGS` | Check Email Flags | Return all six SMTPing risk and domain flags for one email address in one request. Consumes one credit; SMTPing limits synchronous calls to 10 per minute. |
| `SMTPING_CREATE_BULK_CHECK_JOB` | Create Bulk Check Job | Start an asynchronous SMTPing threat-list check for 1 to 100,000 email addresses. Returns a job ID for status polling and consumes one credit per unique address. SMTPing limits job submissions to two per hour. |
| `SMTPING_CREATE_BULK_VERIFICATION_JOB` | Create Bulk Verification Job | Start asynchronous verification for 1 to 100,000 email addresses and return the job ID to use for status polling and result retrieval. Consumes one credit per unique address as work completes; duplicates and unknown results are free. SMTPing limits job submissions to two per hour. |
| `SMTPING_EXPORT_USAGE` | Export Usage | Download SMTPing usage history as a CSV file for the provider's default date range. No date filters are exposed because none are documented. |
| `SMTPING_GET_BULK_CHECK_JOB` | Get Bulk Check Job | Get progress and match counts for an asynchronous threat-list check job. Poll every 20 to 30 seconds until status is Succeeded or Completed before fetching results; polling is free. |
| `SMTPING_GET_BULK_CHECK_RESULTS` | Get Bulk Check Results | Return all address-level matches for a bulk threat-list check job after its status is Succeeded or Completed. Returns 409 while incomplete; fetching results is free. |
| `SMTPING_GET_BULK_VERIFICATION_JOB` | Get Bulk Verification Job | Get progress and summary counts for an asynchronous bulk verification job. Poll every 20 to 30 seconds until status is Succeeded before fetching results; polling is free. |
| `SMTPING_GET_BULK_VERIFICATION_RESULTS` | Get Bulk Verification Results | Return all address-level results for a bulk verification job after its status is Succeeded. Returns 409 while the job is incomplete; fetching results is free. |
| `SMTPING_GET_CREDITS` | Get Credits | Return the connected account's current credit balance, plan, and daily remaining credits. This free read is the balance source of truth. |
| `SMTPING_GET_USAGE` | Get Usage | Return aggregate request, email, credit, status, endpoint, and error usage for SMTPing's current default date range. No date filters are exposed because none are documented or verified. This account read is free. |
| `SMTPING_LIST_USAGE_REQUESTS` | List Usage Requests | Return the newest available page of individual SMTPing API request history, up to the provider default of 50 rows, with page metadata. No continuation input is exposed because request-side pagination parameters are undocumented and unverified. |
| `SMTPING_VERIFY_EMAIL` | Verify Email | Verify one email address and return its deliverability status and domain flags. SMTPing charges one credit unless the result is unknown and limits synchronous calls to 10 per minute. Source: https://smtping.com/openapi.json#/paths/~1verify~1single/post |

## Supported Triggers

None listed.

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

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

## Complete Code

None listed.

## How to build SMTPing MCP Agent with another framework

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

## Related Toolkits

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- [Backendless](https://composio.dev/toolkits/backendless) - Backendless is a backend-as-a-service platform for mobile and web apps, offering database, file storage, user authentication, and APIs. It helps developers ship scalable applications faster without managing server infrastructure.
- [Baserow](https://composio.dev/toolkits/baserow) - Baserow is an open-source no-code database platform for building collaborative data apps. It makes it easy for teams to organize data and automate workflows without writing code.

## Frequently Asked Questions

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

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

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

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

---
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