The full upstream README, mirrored here for reference. Install config, tool schemas, adoption signals, and an original overview live on the Isitdisposable MCP listing page.
A Model Context Protocol (MCP) server that lets an AI agent check whether an email address or domain is disposable, using the isitdisposable.com application programming interface (API).
The server is published to the npm registry and is normally run with npx, so there is nothing to install by hand; the examples below show how to wire it into a Model Context Protocol (MCP) host.
Add this to your Claude Desktop configuration:
An isitdisposable.com key is required. Get a free key at https://isitdisposable.com (a free tier is available), then set it as ISITDISPOSABLE_API_KEY in the configuration above.
| Tool | What it does |
|---|---|
check_email | Checks a single email address to see whether it is disposable. |
check_domain | Checks a single bare domain (no local part) to see whether it is disposable. |
check_batch | Checks up to 100 email addresses or bare domains at once in a single call. Mix full addresses and bare domains freely in the items list; entries containing an @ sign are sent as email addresses, everything else as a domain. |
Every tool returns the same verdict shape. disposable is the core true or false verdict: a disposable address is a throwaway or temporary inbox used to receive a single signup message and evade normal registration requirements, rather than a real, ongoing mailbox. action is the recommended handling of allow, warn, or block. A handful of opt in signals may also be present, including mx_valid (whether the domain's mail servers accept mail), relay (a forwarding or catch all style address), public_domain (a well known free provider such as Gmail), and did_you_mean (a likely intended domain when the one given looks like a typo).
This server always fails open. If a network problem, a timeout, a rate limit, or a server error prevents a real check from completing, the tool call still succeeds (it never throws or crashes the connection). It retries once after a short delay, and if that also fails, it returns a result with checked: false, disposable: null, and action: "allow", along with a note explaining that the check could not be completed. An agent using this tool should treat that outcome as inconclusive, not as a signal that the address is safe.
If no API key is configured, the server still starts normally and responds to the Model Context Protocol (MCP) handshake; each tool call then returns an error result pointing to https://isitdisposable.com to get a free key.