Refer to the following article for step-by-step instructions: Manage quarantined messages and files as an admin in Microsoft 365
You can configure these alerts by going to Alerts in the Security & Compliance Center. Refer to the following article for more information: Submit spam, phish, and false positive messages to Microsoft for analysisĬonfigure alerts to notify you when new messages are quarantined or released. Admins can submit messages via the Submission area in the Microsoft Defender Security Center. End-users can submit messages directly from their quarantine area. Make sure that your users know how to submit spam and phishing messages for analysis and release. Learn more about exclusive settings in anti-phishing policies here.
You can create a policy to block emails that impersonate someone in your organization, emails that request sensitive information, or emails from a specific set of domains. You can refer to the following article for instructions on how to create or modify anti-spam policies: Anti-spam policies in Microsoft 365Ĭonsider using an anti-phishing policy to prevent phishing emails from reaching your users. Make sure that they are up-to-date and configured in a way that effectively blocks spam. Review and verify the settings of your anti-spam policies. Here are some steps that you can take to optimize the spam filter in Microsoft 365 Defender: These emails could still be routed to those addresses if they were listed on any public-facing websites or if they were shared publicly in any way. It's possible that the spam emails are being sent to email addresses that were previously associated with deleted accounts.
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