MCP

POST /mcp speaks JSON-RPC (stateless) with bearer auth — point any MCP client at it:

{ "jsonrpc": "2.0", "id": 1, "method": "initialize" }
{ "jsonrpc": "2.0", "id": 2, "method": "tools/list" }
{ "jsonrpc": "2.0", "id": 3, "method": "tools/call",
  "params": { "name": "send_message",
    "arguments": { "inbox_id": "in_…", "to": ["u@e.com"], "subject": "Hi" } } }

Tools: list_inboxes, create_inbox, list_threads, search_threads, get_thread, list_emails, send_email, reply_to_email, create_draft, list_domains, query_usage. Everything runs inside the caller’s organization — keys scope exactly like REST.

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