Email Inboxes: The Achilles' Heel of Autonomous AI Agents

Autonomous agents that process email are prime targets for prompt injection attacks requiring no user interaction. Unlike conversational assistants limited to information leakage, agents with tool access and credentials can be weaponized to perform destructive actions—opening pull requests, sending emails, modifying systems—based solely on an attacker's knowledge of the agent's email address. This represents one of the most severe unaddressed vulnerabilities in production AI systems today.