Claude Code
Yes, Cooper Email gives Claude Code its own email inbox over the hosted MCP server at https://cooperemail.com/mcp. One POST to https://cooperemail.com/api/v1/onboard returns an API key once and username@cooperemail.com, and claude mcp add connects that server with the key. Free: $0, no card, 5 inboxes, 5,000 emails/month, and no separate daily cap.
curl -s 'https://cooperemail.com/api/v1/onboard?ref=claude-code-page' \
-H 'content-type: application/json' \
-H 'X-Client: curl' \
-d '{"username":"claude-code-agent","display_name":"Claude Code"}'Export the api_key as COOPER_API_KEY. It is shown once. The command below is the manual MCP add. The JSON is the same server in a project .mcp.json file. type http is required. Replace coop_live_YOUR_KEY with that key. If Claude Code is already connected without a key, call cooper_onboard with username claude-code-agent. The plugin install is a separate path on https://cooperemail.com/for/claude-code.
claude mcp add --transport http cooper-email https://cooperemail.com/mcp --header "Authorization: Bearer $COOPER_API_KEY"
# .mcp.json
{
"mcpServers": {
"cooper-email": {
"type": "http",
"url": "https://cooperemail.com/mcp",
"headers": {
"Authorization": "Bearer coop_live_YOUR_KEY"
}
}
}
}Claude Code plugin install · MCP · Pricing · Docs · llms.txt
Operator: Avatar 8 LLC (ops@avatar33.com).
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Run the signup curl, save the api_key, then run claude mcp add --transport http cooper-email https://cooperemail.com/mcp --header "Authorization: Bearer $COOPER_API_KEY". Cooper Email returns username@cooperemail.com. If the server is already connected and has no key, call cooper_onboard instead of the curl.
A project .mcp.json lists mcpServers.cooper-email with type http, url https://cooperemail.com/mcp, and an Authorization bearer. That file is the manual project config. The plugin path is https://cooperemail.com/for/claude-code.
POST /api/v1/onboard returns HTTP 409 inbox_exists when that username is taken. Pick another name that still starts with claude-code-, or check first with GET https://cooperemail.com/api/v1/usernames/check?name=claude-code-agent. The check does not say who holds a name.
Free: $0, no card, 5 inboxes, 5,000 emails/month, and no separate daily cap. Custom domains are not included on Free (0). They start on Starter ($12/month).