Microsoft is preparing a new feature for its Exchange Online service that will help in blocking emails from unsecured on-prem Exchange servers. The feature aims to reduce the risks of malicious emails reaching organizations while also encouraging customers with unsupported or unpatched Exchange servers to secure their on-premises environments. Administrators will receive notifications if their on-prem exchange servers are unsupported or unpatched from security threats and will be reminded to update their infrastructure.
According to Microsoft, it’s critical for customers to protect their Exchange servers by staying current with updates and taking other actions to strengthen their security environment. The new mail flow report in the Exchange admin centre will provide admins with details on unsupported or expired Exchange servers in their environment. The report will inform admins of any messages that are throttled or blocked and what will happen if the server isn’t updated or taken out of service.
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If the server’s issues haven’t been addressed within 30 days, then emails will begin to be blocked. Microsoft is adopting a progressive enforcement approach, where throttling will slowly increase over time, followed by gradual blocking and then blocking all non-compliant traffic. The actions will escalate until the server is removed from service or updated. The new system is set to be applied to all Exchange Server versions and all emails coming into Exchange Online, with Microsoft starting the process with Exchange 2007 servers.