Mailsink README

The full upstream README, mirrored here for reference. Install config, tool schemas, adoption signals, and an original overview live on the Mailsink listing page.

Back to Mailsink View source on GitHub

@mailsink/mcp

Model Context Protocol server for MailSink — programmatic temporary email inboxes for AI agents and test automation.

Gives your agent eight typed tools for provisioning disposable addresses, waiting on signup emails, extracting OTP codes and magic links, and cleaning up after itself. Works in Claude Code, Claude Desktop, Cursor, Windsurf, and any other MCP-aware client.

Get an API key

Copy the key from the one-time reveal. Store it in your password manager or .env.

Export it so the MCP server can read it:

server.ts

export MAILSINK_API_KEY="msk_..."

Free tier is 50 inboxes/month and includes MCP. Pro ($15/mo) and Team ($49/mo) lift the inbox cap, raise email size limits, extend TTL, and bump request rates. See pricing.

Configure your client

Claude Code

Terminal

claude mcp add mailsink -- npx -y @mailsink/mcp

Claude Desktop / Cursor / Windsurf

Add to the mcpServers section of the client's config file:

config.json

{
  "mcpServers": {
    "mailsink": {
      "command": "npx",
      "args": ["-y", "@mailsink/mcp"],
      "env": {
        "MAILSINK_API_KEY": "msk_..."
      }
    }
  }
}

Restart the client. You should see the mailsink server listed with its eight tools.

Tools

Tool	Purpose
`create_inbox`	Provision a throwaway address. Returns `email`, `id`, `expires_at`.
`list_inboxes`	List active inboxes on the account.
`wait_for_email`	Block up to `timeout` seconds (max 120) for any email to arrive.
`get_verification_code`	Extract the most recent OTP from the inbox (polls until found or timeout).
`get_verification_link`	Extract the most recent magic link.
`list_messages`	Summaries of all messages in an inbox.
`get_message`	Full content of a specific message by ID.
`delete_inbox`	Burn an inbox immediately.

Tool

Purpose

create_inbox

Provision a throwaway address. Returns email, id, expires_at.

list_inboxes

List active inboxes on the account.

wait_for_email

Block up to timeout seconds (max 120) for any email to arrive.

get_verification_code

Extract the most recent OTP from the inbox (polls until found or timeout).

get_verification_link

Extract the most recent magic link.

list_messages

Summaries of all messages in an inbox.

get_message

Full content of a specific message by ID.

delete_inbox

Burn an inbox immediately.

Example agent flow

Code

> Sign me up for Figma, capture the verification code, confirm, and
> tell me the plan once you're in.

[agent invokes]
  create_inbox()                                → agent@codenotify.net
  [agent fills the Figma signup form with that address]
  wait_for_email(inbox_id)                      → blocks 30s…
                                                → returns email + OTP
  [agent types the OTP into the Figma form]
  delete_inbox(inbox_id)                        → cleanup

No webhook plumbing. No IMAP credentials. No parsing MIME.

Mailsink README

@mailsink/mcp

Install

Get an API key

Configure your client

Claude Code

Claude Desktop / Cursor / Windsurf

Tools

Example agent flow

Environment variables

Source

License