Stop your agent emailing the wrong recipients

Short summary

Autonomous agents risk sending emails to wrong recipients despite application-level checks. Nylas outbound Rules provide a server-side infrastructure backstop that blocks denied recipients at send time, regardless of code path or retry logic. Defense-in-depth—app allowlist plus infrastructure rule—catches different failure modes.

• •Application-level allowlist checks alone have gaps across multiple code paths, retries, and services
• •Infrastructure-level outbound Rules enforce recipient validation server-side for all sends
• •Defense-in-depth approach: application wrapper you own plus infrastructure denylist that holds when code fails

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