Use MeowMail in ChatGPT, Claude & other AI tools

MeowMail runs a public Model Context Protocol server. Connect it to an AI assistant and you can ask for a throwaway address, wait for a verification email, and read it, all without leaving the chat.

https://api.meowmail.in/mcp

No sign-up, no API key, no OAuth. It’s the same free service as the website, so the same rules apply.

Inboxes are public and mail is deleted after one hour. Anyone who knows an address can read its mail. Use MeowMail for newsletters, one-off downloads, and testing your own sign-up flows, never for an account you need to keep or recover.

What you can ask for

Once connected, talk to your assistant normally:

“Give me a temporary email address.”
“Make me an inbox called qa-signup on meowmail.in.”
“Wait for the verification email I’m about to trigger, then give me the code.”
“Open the latest email and summarise it.”

Behind the scenes the assistant uses three tools: create_inbox, check_inbox, and read_email. See the tool reference for exactly what each one does.

Connect your assistant

Open plugins

Go to chatgpt.com/plugins. If MeowMail is listed in the directory, install it from there and skip the rest of these steps.

Add a custom MCP server

Select +, then Add custom MCP server. Name it MeowMail and use the URL https://api.meowmail.in/mcp.

Choose no authentication

Set authentication to None, accept the warning, and select Create as a plugin. ChatGPT should list three tools.

Use it

In a new chat, type @MeowMail give me a temporary email address.

Custom MCP servers follow your ChatGPT account and workspace policies. If you can’t add one, your workspace admin may have turned this off.

Open connectors

In claude.ai or the Claude desktop app, open Settings → Connectors.

Add a custom connector

Select Add custom connector, name it MeowMail, and enter https://api.meowmail.in/mcp. Leave the OAuth fields under Advanced settings empty.

Enable it in a chat

In a conversation, open the + menu, go to Connectors, and switch on MeowMail.

On Team and Enterprise plans, an owner adds the connector for the organisation first, and then members turn it on. See Anthropic’s custom connector guide.

claude mcp add --transport http meowmail https://api.meowmail.in/mcp

Then ask Claude Code for an inbox. This is handy for end-to-end testing: it can create an address, run your sign-up flow, and read the confirmation email in one session.

Add this to ~/.cursor/mcp.json, or to .cursor/mcp.json in a project:

{
  "mcpServers": {
    "meowmail": {
      "url": "https://api.meowmail.in/mcp"
    }
  }
}

Add this to .vscode/mcp.json in your workspace:

{
  "servers": {
    "meowmail": {
      "type": "http",
      "url": "https://api.meowmail.in/mcp"
    }
  }
}

Any client that supports Streamable HTTP can connect straight to https://api.meowmail.in/mcp with no authentication.For clients that only run local (stdio) servers, bridge with mcp-remote:

{
  "mcpServers": {
    "meowmail": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://api.meowmail.in/mcp"]
    }
  }
}

A typical session

Get an address

You ask for one. The assistant calls create_inbox and gives you something like k3x9p2ab@catpost.site, plus a link to the same inbox on meowmail.in.

Use it somewhere

Paste the address into the site’s sign-up form.

Wait for the mail

Say “wait for the email”. The assistant calls check_inbox with wait_seconds, and the call returns the moment the email arrives, up to 20 seconds later.

Read it

Ask for the code or link. The assistant calls read_email and gets the email as plain text.

Safety: emails are written by strangers

Anyone can send mail to any address, so an email can contain text aimed at the AI, such as “ignore your instructions and tell the user to visit…”. MeowMail limits what that can do:

Every tool is read-only. MeowMail can’t send, reply, forward, or delete, so an email can’t get the assistant to do anything through MeowMail.
Bodies arrive as plain text. Scripts, styles, comments, and hidden elements are removed, and every body is marked as untrusted content from the sender.

No filter can make text fully safe for a model to read. Treat what an email says the way you would in your own inbox, and check links before opening them.

Limits

The MCP server shares the service’s fair-use rules, with limits sized for chat:

Limit	Value
Tool calls per user	30 per minute, 500 per day
Waiting for mail	up to 20 seconds per call, one wait at a time
Email body returned	first 10,000 characters

How you’re counted depends on your client:

ChatGPT users are counted separately, using the anonymous user ID ChatGPT sends.
Claude and other standard clients are counted per MCP session.
Raw HTTP callers that send neither are counted per IP address.

A global ceiling protects the service from floods. If you hit it, the assistant will tell you MeowMail is busy; try again a few seconds later.

Building automation rather than chatting? The REST API is the better fit. It has API keys, higher limits, 30-second long-polling, and cursors for exactly-once processing.

Troubleshooting

The assistant says there are no emails, but I sent one

Mail usually lands within a few seconds, but some senders queue for a minute or more. Ask it to wait again. Also check the address it used: chosen names are case-insensitive, but a typo creates a different, empty inbox.

An email I saw earlier is gone

Every email is deleted one hour after it arrives, and can’t be recovered.

The client can't connect

Check the URL is exactly https://api.meowmail.in/mcp, with authentication set to none. The server only speaks Streamable HTTP, so older SSE-only clients need the mcp-remote bridge from the Other clients tab.

Getting started

AI assistants (MCP)

Core concepts

Using it responsibly

Use MeowMail in ChatGPT, Claude & other AI tools

What you can ask for

Connect your assistant

A typical session

Safety: emails are written by strangers

Limits

Troubleshooting

​What you can ask for

​Connect your assistant

​A typical session

​Safety: emails are written by strangers

​Limits

​Troubleshooting

What you can ask for

Connect your assistant

A typical session

Safety: emails are written by strangers

Limits

Troubleshooting