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Receiving a Microsoft 365 Security notification titled "You Have Messages in Quarantine" is a normal part of the platform's security system. It signifies that potential spam or harmful messages have been isolated for your protection. By following the instructions in the email and visiting the quarantine website, you can efficiently review, release, or block messages as necessary.

For further information and details, refer to the official Microsoft documentation at the provided link: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/quarantine-quarantine-notifications?view=o365-worldwide. 

Introduction: If you receive an email with the subject line "Microsoft 365 Security: You Have Messages in Quarantine," rest assured that this email is legitimate and sent by Microsoft Exchange. Its purpose is to inform you that certain email addresses you marked as spam, or messages that the system has identified as spam or potentially harmful, have been isolated and placed in quarantine. In this article, we'll delve into the details of these notifications and the steps you can take to manage them effectively.

Understanding the Quarantine Notification: When you encounter an email with the specified subject line, it indicates that the Microsoft Exchange platform has detected messages considered suspicious or harmful to your email security. As a safeguard measure, such messages have been placed in quarantine to prevent any potential damage to your system and data.

What Triggers Quarantine: The messages sent to quarantine fall into two categories:

• User-Defined Spam: These are emails reported as spam by you or other users within your organization.
• System-Identified Threats: Messages flagged automatically by the system's security measures due to their suspicious nature, potential harm, or phishing characteristics.

Taking Action: The quarantine notification email provides you with options to manage the messages held in quarantine effectively. Here are the actions you can take:

• Review: If you suspect that a message was incorrectly placed in quarantine, you have the option to review it to confirm its legitimacy before taking further action.
• Release: For genuine emails mistakenly quarantined, you can release them from the quarantine to ensure they reach your inbox as intended.
• Release and Report: If you find a legitimate message flagged as spam or malicious, you can release it and simultaneously report it as not being spam, improving the system's accuracy.
• Block: If you consistently receive unwanted emails from a particular address, you can block future messages from that sender.

Accessing the Quarantine Website: To manage the quarantined messages, click on the provided link in the notification email. This link will direct you to the designated quarantine website, where you can perform the aforementioned actions conveniently.