Malicious MCP Server on npm postmark-mcp Harvests Emails
On September 25, 2025, the npm package postmark-mcp, an MCP (Model Context Protocol) server intended to let AI assistants send emails via Postmark, was reportedly modified to secretly exfiltrate email contents by adding a blind-copy (BCC) to an external domain. Current analysis suggests the behavior began around 1.0.16 and persisted in later versions.