How to Set Up an Exchange Online Mailbox for OpenClaw

This article provides a detailed technical walkthrough for setting up an Exchange Online mailbox for an automation agent like OpenClaw. It explains why a shared mailbox is preferred over a user or room mailbox, and outlines a security model using Microsoft Entra app registration with certificate authentication, Exchange RBAC for Applications to scope mailbox access, and transport rules for outbound email restrictions. The guide covers the rationale behind each choice, including avoiding stored credentials and ensuring auditable, constrained access. It is relevant to IT professionals and developers working with Microsoft 365 automation, Graph API, and secure mailbox configuration.