Microsoft 365 provides a comprehensive cloud-based approach with Advanced Threat Protection for securing your mailbox. Each day, you will receive a quarantine summary to review flagged messages. You can also go directly to your page by navigating to https://security.microsoft.com/quarantine.

Quarantine Summary

Spam and Phishing quarantine summary messages will be sent from quarantine@messaging.microsoft.com to your Office 365 email inbox on a daily basis. You can take action on the messages directly from the quarantine summary:

Review Message - Opens your quarantine to review details of the message.
Release - Releases message from your quarantine.
Please Note: messages marked “Prevented Phish” do not have the option to release from the summary.
Block Sender - add sender to Blocked Senders Lists.

A Quarantine Review message in a user's inbox on Outlook. Options are shown to Review the message, Release it, or Block the sender.

To review and release a message follow the these simple steps:

Step 1:
Click the Review Message button in the daily summary. Quarantine will open in your web browser.

Step 2:
Read the message to determine if the email is actually suspicious. Note the subject, sender, and other attributes to determine if the email is legitimate.

You can also preview the message to verify its contents. As always, be wary of any links found in the message preview.

Step 3:
If the email is legitimate, release the message to your inbox. If it is not, you can Delete from quarantine. Messages will be automatically removed from Quarantine after 30 days.

Reporting and Blocking

Occasionally, unwanted emails will make their way to your inbox. When this happens, you can report emails as junk or phishing, or block the senders. Likewise, you can mark a sender as safe to prevent them from being blocked in the future.

Report Junk or Phishing

You can report any email in Outlook as junk or phishing. Simply right click on an email message and select Report > Report junk or Report phishing.