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Claude (Web & Desktop)

Claude Web (claude.ai) and Claude Desktop support Custom MCP Connectors with Dynamic Client Registration. Setup takes about two minutes.

Setup​

1. Copy the MCP URL from the portal​

In the inboxmcp portal under Integrations you'll find your MCP URL — format: https://mcp.inboxmcp.io/mcp.

2. Open Connectors in Claude​

In the left sidebar, click Customize.

Claude sidebar with the 'Customize' entry highlighted.
Claude sidebar — open "Customize".

Then pick the Connectors tab and click the + icon.

Connectors tab with the plus button to add a new connector.
In the "Connectors" tab, add a new one via the plus icon.

3. Enter the connector details​

Name (e.g. "inboxmcp.io") and the MCP URL from above. Leave Client ID / Secret empty — Claude registers itself automatically via OAuth.

'Add custom connector' dialog with name inboxmcp.io and URL https://mcp.inboxmcp.io/mcp.
Enter name and MCP URL.

4. Connect​

Click Connect. A browser tab opens, you sign in to inboxmcp and confirm access.

Connector status 'You are not connected to inboxmcp yet.' with a 'Connect' button.
"Connect" starts the OAuth flow — you're connected afterwards.

What Claude can do now​

  • List and search mailboxes
  • Read individual messages, including attachments
  • With Premium / Business: create drafts, move messages, manage folders

The tools available depend on your inboxmcp plan — see MCP tools overview.

Disconnect​

In Claude: Customize → Connectors → inboxmcp → Remove.