resend-streamable-mcp-server

The server implements bearer token authentication and input validation via Zod schemas, which are good practices. However, a critical security vulnerability exists in its default configuration: the `isAllowedOrigin` function (used for origin validation) is a placeholder that always returns `true` in production. This means, by default, the server accepts requests from *any* origin when deployed to a public endpoint, making it highly susceptible to Cross-Site Request Forgery (CSRF) attacks if a client is tricked into sending requests with a valid bearer token. Additionally, the README explicitly warns that giving an AI agent access to email sending capabilities carries significant risks, including misinterpretation of instructions and unintended email broadcasts. Users must implement client-side review and confirmation mechanisms.