How to Handle O365 Shared Mailboxes in CI/CD Test Automation
Testing email workflows—like OTP verification, password resets, or automated notifications—is a core requirement for robust end-to-end (E2E) automation. However, automating Office 365 (O365) Shared Mailboxes via UI logins or legacy IMAP basic authentication is a nightmare. UI logins trigger MFA, IMAP basic auth is deprecated across Microsoft 365, and browser automation for Outlook web is…
Automating Office 365 Shared Mailboxes through UI logins or outdated IMAP authentication proves challenging. Microsoft Graph API offers a robust alternative by utilizing Client Credentials (App-Only) Flow within automation frameworks. This guide outlines the steps to implement this solution:
1. Configure Azure AD (Entra ID) permissions:
- Register an application in the Azure Portal.
- Add Microsoft Graph permissions: Mail.ReadWrite and Mail.Send.
- Grant Admin Consent for these permissions.
- Generate a Client Secret or upload a Certificate.
- Save Tenant ID, Client ID, and Client Secret in environment variables.
- Restrict app registration scope to the specific shared mailbox using ApplicationAccessPolicy.
2. Obtain OAuth 2.0 Tokens:
- Send a POST request to the Azure AD token endpoint.
- Include Client ID, Client Secret, and grant_type as client_credentials.
3. Interact with the Shared Mailbox:
- Retrieve the latest unread email for OTP or link extraction using a GET request.
- Parse the JSON response to extract verification links, tokens, or body text.
- Send emails through the shared mailbox using a POST request to the sendMail endpoint.
This approach provides fast, reliable, and flake-free email validation in CI/CD pipelines. Direct HTTP API execution is significantly faster than UI navigation, eliminates MFA blockers, and ensures consistent execution without relying on Outlook web interfaces or loading delays.
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