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GrabMail disposable email

by grabmail.io · remote · no sign-in to list tools · v1.0.0 · published by io.grabmail

Disposable email for agents: create an inbox, wait for the message, read the code. No key needed.

Deletes · 1Changes · 1
CompareRegistry entry

6 tools: 1 can delete or cancel things, 1 change things and 4 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http grabmail https://grabmail.io/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

6 tools

Deletes or cancels 1Claude Code: deny
  • delete_messageRemove a message now rather than waiting for it to expire.No findings

    Why it is in this group

    • The name "delete_message" says "delete": a word for removing or ending something.
    Description, as the server wrote it
    Remove a message now rather than waiting for it to expire. Idempotent.
Changes things 1Claude Code: ask
  • create_inboxInvent a fresh, unused disposable email address you can give out immediately.No findings

    Why it is in this group

    • The name "create_inbox" says "create": a word for a change.
    Description, as the server wrote it
    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: grabmail.io, mixozia.com, linqmail.com. With a paid key sent as Authorization: Bearer, a premium-pool domain from list_domains works too.
Only reads 4Claude Code: allow
  • list_domainsThe public domains anyone may use.No findings

    Why it is in this group

    • The name "list_domains" says "list": a word for reading.
    Description, as the server wrote it
    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 result. With a paid key sent as Authorization: Bearer, the result also lists the premium-pool domain names.
  • list_messagesEverything waiting at an address, newest first.Reads private dataReads text others writeNo findings

    Why it is in this group

    • The name "list_messages" says "list": a word for reading.

    What it can reach

    • private-dataThe name "list_messages" says "list" and "message": it reads messages.
    • untrusted-inputThe name "list_messages" says "list" and "message": it reads messages, which other people can write.
    Description, as the server wrote it
    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_messageThe full message: sender, subject, plain text, HTML and any attachments.Reads private dataReads text others writeNo findings

    Why it is in this group

    • The name "read_message" says "read": a word for reading.

    What it can reach

    • private-dataThe name "read_message" says "read" and "message": it reads messages.
    • private-dataThe description's first sentence says "message": it reads messages.
    • untrusted-inputThe name "read_message" says "read" and "message": it reads messages, which other people can write.
    • untrusted-inputThe description's first sentence says "message": it reads messages, which other people can write.
    Description, as the server wrote it
    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 rendering of that HTML rather than nothing, with link targets and image alt text kept.
  • wait_for_messageBlocks until a new message arrives at the address, then returns it in full — the tool to use after submitting a sign-up form.Reads private dataReads text others writeNo findings

    Why it is in this group

    • The name "wait_for_message" says "wait": a word for reading.

    What it can reach

    • private-dataThe name "wait_for_message" says "wait" and "message": it reads messages.
    • private-dataThe description's first sentence says "message": it reads messages.
    • untrusted-inputThe name "wait_for_message" says "wait" and "message": it reads messages, which other people can write.
    • untrusted-inputThe description's first sentence says "message": it reads messages, which other people can write.
    Description, as the server wrote it
    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 waits for a message from a particular sender or with particular words in the subject, ignoring anything else that arrives.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged outbound.

Reads private data3
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write3
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Looked at Oct 22, 2026, 15:08 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable
yes
HTTP status of an anonymous initialize
200
tools/list served without credentials
yes
Tools that change things, listed without credentials
2
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
none
RFC 9728 protected resource metadata
none
Authorization servers
none
Legacy HTTP+SSE transport
no
Dynamic client registration
not observed
Client ID metadata documents
not observed
  • HighThe whole server

    The endpoint served tools/list without credentials, and the list has 2 tools that change things (1 destructive, 1 write). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://grabmail.io/mcp: tools/list returned 6 tools to an anonymous client, including delete_message (destructive), create_inbox (write)

    What this check looks for

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http grabmail https://grabmail.io/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__grabmail__list_domains",
      "mcp__grabmail__list_messages",
      "mcp__grabmail__read_message",
      "mcp__grabmail__wait_for_message"
    ],
    "ask": [
      "mcp__grabmail__create_inbox"
    ],
    "deny": [
      "mcp__grabmail__delete_message"
    ]
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as grabmail. Review it before you use it.

Capability tags behind 3 rules
  • mcp__grabmail__list_messages private-data, untrusted-input
  • mcp__grabmail__read_message private-data, untrusted-input
  • mcp__grabmail__wait_for_message private-data, untrusted-input