Postmark

Connects Claude to Postmark's transactional email API through the Pipeworx gateway. You get two tools: send for individual emails and send_batch for up to 500 at once. Runs over streamable HTTP, so no local installation needed. Part of a larger gateway that bundles 673+ data sources, though you can use just the Postmark endpoint if that's all you need. Worth noting the ask_pipeworx natural language interface if you want to skip manual tool calls. Useful when you're building workflows that need to fire off confirmation emails, notifications, or bulk campaigns directly from your AI context.