tempmail-mcp

MCP server for disposable email. Gives an assistant its own throwaway inbox, then hands back the confirmation code out of the message that arrives.

The problem it solves: an agent walking through a signup flow hits the point where a real email address is needed, and a human has to step in to read a code out of their inbox. At that moment the automation stops being automation.

Install

{
  "mcpServers": {
    "tempmail": {
      "command": "npx",
      "args": ["-y", "tempmail-mcp"],
      "env": {
        "TEMPMAIL_API_KEY": "tm_your_key_here"
      }
    }
  }
}

Get a key at tempmailgenerator.net/account. Free, no card, one key per account.

For Claude Code:

claude mcp add tempmail --env TEMPMAIL_API_KEY=tm_your_key -- npx -y tempmail-mcp

Tools

Tool	What it does
create_mailbox	Take an address. Random name and domain unless you ask otherwise.
wait_for_code	Block until mail arrives, return the code and the activation link.
list_messages	What is in the inbox, newest first, with previews.
read_message	Full body of one message.
delete_mailbox	Clean up when done.

wait_for_code is the one that matters. It holds the connection until the message lands rather than polling, so the assistant does not burn turns checking an empty inbox, and it returns the digits already extracted instead of a wall of HTML for the model to squint at.

A typical run

1. create_mailbox gives laura.ellis5427@...
2. The agent submits that address to the signup form it is working through.
3. wait_for_code returns 481902 and the confirmation link a second later.
4. The agent finishes the flow.

Limits and manners

Mailboxes live 24 hours. One key allows 300 new mailboxes an hour and 100 alive at once, which is far past what an interactive agent needs and short of what a signup farm wants.

Addresses come from a pool reserved for automation and are recognisably disposable. Point this at systems you own or test. Pointed at somebody else's service to mass produce accounts, it becomes their incident and then ours.

Configuration

Variable	Default	Purpose
TEMPMAIL_API_KEY	required	Your key.
TEMPMAIL_BASE_URL	https://tempmailgenerator.net	Only for self-hosted installs.

API reference: https://tempmailgenerator.net/api/

License

MIT