AgentFirstStack Mail for Claude.ai
com.agentfirststack/mail
Email inboxes for AI agents: wait for mail, pull out verification codes and links, reply. Free.
client:Claude.ai
transport:streamable-http
Install AgentFirstStack Mail in Claude.ai
Settings → Connectors → Add custom connector
https://mail.agentfirststack.com/mcpClaude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs