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Connect your AI tool to Unsendbox

Unsendbox works with any MCP-compatible AI client. Pick your preferred tool and connect it to the Unsendbox MCP endpoint in minutes.

Get your API key

Supported AI clients

Unsendbox exposes a Streamable HTTP MCP endpoint. Any client that speaks MCP can connect.

ChatGPT (via MCP widget)
Use the Unsendbox MCP widget inside ChatGPT to run email operations directly from chat.
Claude Desktop
Add Unsendbox as an MCP server in Claude Desktop settings. Full tool access with approval prompts.
Claude Code (CLI)
Register Unsendbox MCP in your project .mcp.json for terminal-based AI email workflows.
OpenCode / Codex CLI
Wire the MCP endpoint into your opencode.json or agent config for ChatGPT/Codex sessions.
Any MCP client
Point any MCP-compatible tool at the Unsendbox Streamable HTTP endpoint with your API key.

1) Get your MCP endpoint and API key

Every Unsendbox workspace has an MCP endpoint ready to use.

  1. 01Go to Dashboard → Settings → API Keys.
  2. 02Create or copy an existing API key for MCP access.
  3. 03Your MCP endpoint is: https://app.unsendbox.com/api/v1/mcp
  4. 04Keep your API key secure — it grants full workspace access.

2) Connect from ChatGPT

Use the Unsendbox MCP widget for zero-config setup.

  1. 01Open ChatGPT and navigate to the MCP widgets panel.
  2. 02Search for "Unsendbox" or add the MCP endpoint URL manually.
  3. 03Authenticate with your API key when prompted.
  4. 04Unsendbox tools (send_email, list_threads, connect_domain, etc.) appear in your chat.

2) Connect from Claude Desktop

Add Unsendbox as an MCP server in Claude Desktop preferences.

  1. 01Open Claude Desktop → Settings → MCP Servers.
  2. 02Click "Add Server" and enter the Streamable HTTP endpoint URL.
  3. 03Set the API key in the server authentication field.
  4. 04Restart Claude Desktop — Unsendbox tools now appear with approval prompts.

2) Connect from Claude Code (CLI)

Register MCP in your project config for terminal workflows.

  1. 01Add the Unsendbox MCP server to your project .mcp.json file.
  2. 02Set the transport type to "streamable-http" with the endpoint URL.
  3. 03Pass the API key via environment variable or inline config.
  4. 04Run claude and verify tools are discovered with /mcp.

3) Verify your connection

Run these checks from any connected client to confirm setup.

List domains
Run the list_domains tool — you should see your connected domains (or empty if new workspace).
List addresses
Run list_addresses — returns all configured sender identities.
Send a test email
Use send_email with a verified sender to confirm end-to-end delivery.

Recommended workflow

Use your AI client as the command surface and Unsendbox dashboard for review.

AI client for operations
Run send, reply, domain, and routing operations from your preferred AI chat or CLI.
MCP for execution
Domain, address, thread, and mirror-rule operations happen through MCP tools for repeatability.
Dashboard for review
Keep final visibility, manual approvals, and exception handling in the Unsendbox UI.