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Mailsink MCP server

by heocoi·io.github.heocoi/mailsink·v0.1.5
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Disposable inboxes for AI agents and CI: catch the verification email, read the OTP or link.

B78/100grade B
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Safety scan
B78/100

full report

Adoption
New

0 stars39 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Mailsink tools (8, 3 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • create_inboxwrite action

    Create a temporary email inbox. Returns the email address to use for signups/verification.

  • delete_inboxwrite action

    Delete an inbox and all its messages.

  • get_message

    Get the full content of a specific message.

  • get_verification_code

    Get the most recent OTP/verification code from an inbox. Polls if no code found yet.

  • get_verification_link

    Get the most recent verification/magic link from an inbox. Polls if no link found yet.

  • list_inboxes

    List all active (non-expired) inboxes.

  • list_messages

    List all messages in an inbox.

  • wait_for_emailwrite action

    Wait for an email to arrive in an inbox. Polls until a message appears or timeout.

Public scan report

scanner v0.1.10 · 2026-11-02 · same rubric, same numbers if you re-run it

no findings
  • Code scan3 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 73 days ago12/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 78/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Mailsink compares

Against every graded Email MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
78/100
higher than 62% of 916 Email servers
Tools
8
the typical Email server has 7
Tools that change things
38%
typical: 25%. Fewer write tools means less an agent can break
Downloads a week
39
more than 25% of 235 Email servers with a package

What its tools let an agent do: 5 read · 1 create · 1 change · 1 delete

Install Mailsink in Claude Code, Cursor or VS Code

Runs npx -y @mailsink/mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add mailsink -- npx -y @mailsink/mcp
Add to Cursor

What the publisher says

From the Mailsink repository's README, as published. We do not edit it. Read it 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.

Install

npm install -g @mailsink/mcp

Or run via npx without installing:

npx @mailsink/mcp

Get an API key

or .env.

  1. Sign in at with GitHub.
  2. Copy the key from the one-time reveal. Store it in your password manager
  1. Export it so the MCP server can read it:
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

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

Claude Desktop / Cursor / Windsurf

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

{
  "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

Example agent flow

> 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.

Environment variables

override for self-hosted or dev API.

  • MAILSINKAPIKEY (required) — your account's API key.
  • MAILSINKAPIURL (optional, default https://api.mailsink.dev) —

Source

License

MIT — see LICENSE.

Nothing above is checked by us. What we check is on the safety report.

Mailsink: common questions

Is Mailsink MCP server safe?
Mostly: it is graded B (78/100). Read the Mailsink safety report
How do I install Mailsink?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Mailsink need an API key?
Yes. The registry entry asks for MAILSINK_API_KEY.
Is Mailsink maintained?
The last commit was 75 days ago (2026-08-21). The latest release is v0.1.5.
What can I use instead of Mailsink?
Servers from other publishers that do the same job: send0 MCP server, smails MCP server and EmptyInbox MCP server.
How does Mailsink compare with other Email MCP servers?
safety score 78/100 (higher than 62% of 916 Email servers); tools 8 (the typical Email server has 7); tools that change things 38% (typical: 25%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Mailsink

Same job from other publishers: the closest match first, then the best rated.

  • send0
    Email inboxes for AI agents: create an address, wait for codes and links, send and reply in threads.
    A
  • smails
    Free disposable email for AI agents: a throwaway inbox to read verification codes over MCP.
    B
  • EmptyInbox
    Zero-config disposable email inboxes for AI agents: create, read mail, await verify codes.
    B
  • e2a — email for AI agents
    Authenticated email gateway for AI agents — per-agent inboxes, HITL approval, SPF/DKIM verified.
    A
  • Agenticmail
    Real email and SMS for AI agents — send mail, receive verification codes, drive a real inbox.
    B