Mailsink

Disposable inboxes for AI agents and CI: catch the verification email, read the OTP or link.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "mailsink": {
      "command": "npx",
      "args": [
        "-y",
        "mailsink"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

@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

Terminal

npm install -g @mailsink/mcp

Or run via npx without installing:

Terminal

npx @mailsink/mcp

Get an API key

Sign in at https://mailsink.dev/app with GitHub.
Copy the key from the one-time reveal. Store it in your password manager or .env.
Export it so the MCP server can read it:
server.ts
```
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

Terminal

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

Claude Desktop / Cursor / Windsurf

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

config.json

{
  "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

Tool	Purpose
`create_inbox`	Provision a throwaway address. Returns `email`, `id`, `expires_at`.
`list_inboxes`	List active inboxes on the account.
`wait_for_email`	Block up to `timeout` seconds (max 120) for any email to arrive.
`get_verification_code`	Extract the most recent OTP from the inbox (polls until found or timeout).
`get_verification_link`	Extract the most recent magic link.
`list_messages`	Summaries of all messages in an inbox.
`get_message`	Full content of a specific message by ID.
`delete_inbox`	Burn an inbox immediately.

Example agent flow

Code

> 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

MAILSINK_API_KEY (required) — your account's API key.
MAILSINK_API_URL (optional, default https://api.mailsink.dev) — override for self-hosted or dev API.

Source

https://github.com/heocoi/mailsink/tree/main/mcp

License

MIT — see LICENSE.

Read the full README →View source on GitHub →

Related MCP Servers

View all in Communication View all alternatives

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about Mailsink

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "mailsink": { "command": "npx", "args": ["-y", "mailsink"] } }

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Technical Specs & Signals

CategoryCommunication

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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More in 💬 Communication →Best MCP servers for Slack & Communication →Alternatives to Mailsink →Install in Claude Desktop Install in Cursor Install in VS Code

Mailsink

Disposable inboxes for AI agents and CI: catch the verification email, read the OTP or link.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "mailsink": {
      "command": "npx",
      "args": [
        "-y",
        "mailsink"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

@mailsink/mcp

Model Context Protocol server for MailSink — programmatic temporary email inboxes for AI agents and test automation.

Install

Terminal

npm install -g @mailsink/mcp

Or run via npx without installing:

Terminal

npx @mailsink/mcp

Get an API key

Sign in at https://mailsink.dev/app with GitHub.
Copy the key from the one-time reveal. Store it in your password manager or .env.
Export it so the MCP server can read it:
server.ts
```
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

Terminal

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

Claude Desktop / Cursor / Windsurf

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

config.json

{
  "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

Tool	Purpose
`create_inbox`	Provision a throwaway address. Returns `email`, `id`, `expires_at`.
`list_inboxes`	List active inboxes on the account.
`wait_for_email`	Block up to `timeout` seconds (max 120) for any email to arrive.
`get_verification_code`	Extract the most recent OTP from the inbox (polls until found or timeout).
`get_verification_link`	Extract the most recent magic link.
`list_messages`	Summaries of all messages in an inbox.
`get_message`	Full content of a specific message by ID.
`delete_inbox`	Burn an inbox immediately.

Example agent flow

Code

> 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

MAILSINK_API_KEY (required) — your account's API key.
MAILSINK_API_URL (optional, default https://api.mailsink.dev) — override for self-hosted or dev API.

Source

https://github.com/heocoi/mailsink/tree/main/mcp

License

MIT — see LICENSE.

Read the full README →View source on GitHub →

Related MCP Servers

View all in Communication View all alternatives

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about Mailsink

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "mailsink": { "command": "npx", "args": ["-y", "mailsink"] } }

AllMCPs Directory Badge

Full Badge Customizer

Showcase your server listing on GitHub or your project documentation. Embed this dynamic SVG badge to highlight official listing status and live engagement.

Badge Style:

Live Dynamic SVG Preview

Markdown (GitHub README)

[![AllMCPs](https://allmcps.com/api/badge/mailsink?style=directory)](https://allmcps.com/mcp/mailsink)

HTML Embed

<a href="https://allmcps.com/mcp/mailsink"><img src="https://allmcps.com/api/badge/mailsink?style=directory" alt="Mailsink on AllMCPs" /></a>

Technical Specs & Signals

CategoryCommunication

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

★ Featured

Moxie Docs MCP

MCP & Agent Skills for Automated Documentation, and codebase conventions + context

Explore Server →

Own this project?

Free dofollow backlink: add your website and place the AllMCPs badge on it — no claim needed. We detect it automatically and keep it verified as long as the badge stays live.

Claim & get free dofollow

Share & Embed

Add our SVG badge (dark/light directory styles) or embeddable widget to your site.

Explore more

More in 💬 Communication →Best MCP servers for Slack & Communication →Alternatives to Mailsink →Install in Claude Desktop Install in Cursor Install in VS Code