GrabMail MCP server

• Registry nameio.grabmail/mcpverified in the MCP registry

The registry name sits under grabmail.io. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-20
• Tools6
• Server calls itselfgrabmail
• Server version1.0.0
• Protocol version2025-06-18

On 2026-10-20 the server answered initialize and tools/list without a sign-in. First answer in 223 ms.

• Its tools do read verification codes inside automated test suites, but not route all mail on a domain to one inbox.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP score64 of 100answers 100 · does the job 50 · definitions 75 · context 100 · connects 100 · lowered by the warning signs below
• What an agent can do with it1 of 2 use cases
• Answered100% of days7 of 7 daily checks
• Median first answer553 ms
• Space in an agent's context≈ 966 tokensthe definitions of all its tools (6), which an agent carries on every turn
• Tool definitionsB · 75 of 100
• Typed results0 of 6 toolsdeclared outputSchema: results come typed, read once

• Parameters without a description: in 3 of 6
• Not saying whether it only reads or can destroy: 6 of 6

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• create_inbox

  Invent a fresh, unused disposable email address you can give out immediately. Nothing is created or reserved server-side — an address exists as soon as mail arrives at it — so this never fails and needs no account. Public domains…

• list_domains

  The public domains anyone may use. A domain of your own needs no account or key either — just an MX record pointing here. These public domains are on disposable-mail blocklists; if a form rejects them, see the premium pool noted in the…

• list_messages

  Everything waiting at an address, newest first. Returns immediately, including when the mailbox is empty — use wait_for_message if you are expecting something that has not arrived yet.

• read_message

  The full message: sender, subject, plain text, HTML and any attachments. This is where a confirmation code or a sign-in link will be. Read `text`: when the sender shipped HTML only, as most transactional mail does, it holds a plain-text…

• wait_for_message

  Blocks until a new message arrives at the address, then returns it in full — the tool to use after submitting a sign-up form. Waits at most 25 seconds and then returns with timed_out set to true; call it again to keep waiting. Optionally…

• delete_message

  Remove a message now rather than waiting for it to expire. Idempotent.