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Stopping Phishing Emails in Microsoft 365 and Google Workspace: Practical Configurations

Phishing is the leading attack vector against schools. While user awareness training is essential, the strongest defense is stopping phishing emails before they ever reach staff and students. Microsoft 365 (Exchange Online Protection) and Google Workspace provide built-in security controls that can block or quarantine phishing attempts at no extra cost. Here’s how to configure them. Microsoft 365 (Exchange Online / Entra) Microsoft Documentation: https://learn.microsoft.com/en-us/defender-office-365/anti-phishing-policies-mdo-configure 1. Enable Anti-Phishing Policies Go to the Microsoft 365 Security & Compliance Center . Navigate to Threat Management → Policy → Anti-Phishing . Enable built-in impersonation protection to detect lookalike domains and spoofed accounts. Impact: Helps prevent phishing that impersonates staff, leadership, or vendors. 2. Quarantine Suspicious Messages Instead of sending suspicious emails to Junk, configure Quarantine policies . Go to Threat Policies → ...

GAM: Phishing Email IR

GAM is a powerful tool but with great power comes great responsibility. Some commands can cause irreversible changes if used incorrectly, so always test and proceed with caution. GAM Documentation and Installation Instructions:  https://github.com/GAM-team/GAM/wiki GAM Commands Query User Inbox for a Specific Message You can locate a specific email by Message-ID or by Subject line . gam user <user email> show messages query "rfc822msgid:<message ID>" Or: gam user <user email> messages query "subject:<Email Subject>" Delete a Single Email To delete an email (after exporting for safety), use: gam user <user email> export messages query "rfc822msgid:<message ID>" targetfolder <folder path> Delete a Single Email From Multiple Accounts If you need to remove a message across many accounts, use a CSV list of users. By Message-ID: gam csv "users.txt" gam user "~<file header name>...