How to Use Microsoft Graph API for O365 Shared Mailbox Test Automation

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Testing email workflows such as OTP verification and password resets is essential for end-to-end automation, but traditional methods like UI logins and IMAP basic authentication are unreliable or deprecated in Microsoft 365. A more robust approach involves using the Microsoft Graph API with a Client Credentials flow, which allows programmatic mailbox access without triggering multi-factor authentication. Developers must register an app in Azure's Entra ID portal, configure the appropriate Mail.ReadWrite and Mail.Send permissions, and securely store credentials as environment variables in their CI/CD pipeline. Once authenticated, the API enables direct REST calls to read or send emails from a shared mailbox in milliseconds, eliminating the flakiness associated with browser-based Outlook automation. As a security measure, access can be scoped to a specific mailbox using an ApplicationAccessPolicy in Exchange Online PowerShell.

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