Show HN: Piloxa – an MCP server that sends USPS Certified Mail from your AI

Piloxa's launch of an MCP server that sends USPS Certified Mail from AI agents “turns a finished letter into a review link, with nothing printed, mailed or charged until a person approves it” introduces a new, verifiable outbound communication channel for AI‑generated content. For website owners, this means AI bots crawling or interacting with their sites can now trigger legally binding certified mail deliveries without manual oversight. Content that previously stayed digital—such as contract drafts, policy updates, or compliance notices—can be escalated to physical mail, increasing the stakes for data accuracy and privacy. Sites that host user‑generated AI prompts, form submissions, or API endpoints must consider that a single API call could result in a USPS Certified Mail piece being generated and mailed, potentially exposing sensitive information or incurring unexpected costs. **Actionable steps:** 1. **Update your llms.txt** to explicitly disallow any “send‑mail” or “certified‑mail” intents for unverified agents, adding a line like `Disallow: /api/send-certified-mail`. 2. **Implement bot‑traffic monitoring** that flags requests containing the Piloxa MCP endpoint (`/piloxa/mcp`) and triggers a manual approval workflow before allowing the call to proceed. 3. **Audit form and API inputs** for PII or confidential data and enforce server‑side validation that requires human confirmation before any certified mail request is queued, preventing accidental mass mailing and protecting compliance.