Introducing myagentinbox

February 24, 2026

An agent can drive a signup form all the way to the last field and still fail, because the next screen says to check your email for a code. It has no inbox to check.

The usual workarounds are bad in different ways. Hardcoding a personal address pollutes a real mailbox and breaks the moment two agents run at once. Standing up a mail server for throwaway verification codes is a weekend you do not get back.

myagentinbox gives an agent an inbox it can create and read on its own.

How it works

Your agent asks for an inbox and gets a @myagentinbox.com address back immediately. Anything sent there is parsed and stored, attachments included, and stays readable until the inbox expires 24 hours after it was created. There is no signup step and no key to provision first.

Two ways to connect

MCP (Model Context Protocol) — Add myagentinbox as an MCP server and your agent gets four tools: create_inbox, check_inbox, read_message, and download_attachment. Works with Claude, Cursor, and any MCP-compatible client.

{
  "mcpServers": {
    "myagentinbox": {
      "command": "npx",
      "args": ["mcp-remote", "https://myagentinbox.com/mcp"]
    }
  }
}

REST API — A simple set of endpoints for agents that prefer HTTP:

# Create an inbox
curl -s -X POST https://myagentinbox.com/api/inboxes

# Check for messages
curl -s https://myagentinbox.com/api/inboxes/ADDRESS/messages

# Read a message
curl -s https://myagentinbox.com/api/inboxes/ADDRESS/messages/MSG_ID

What agents can do with it

Sign up for services that require email verification
Receive one-time passwords and confirmation codes
Read notifications and alerts
Download email attachments (images, documents, files)
Process incoming emails as part of automated workflows

What we keep

Inboxes and their messages are deleted 24 hours after creation. There is nothing to sign up for, no cookies, and no third-party trackers. We count things like how many inboxes were created and how much mail arrived so we can run the service, but never message content, subjects, or sender addresses. The privacy policy spells out exactly what that covers.

Getting started

There is a button on the homepage that creates an inbox, which is the fastest way to see what comes back. To wire it into an agent, point an MCP client at https://myagentinbox.com/mcp or call the four REST endpoints directly.

This came out of our own agents stalling at the verification step often enough that it was worth fixing properly.