#exchange-server
9 articles
Tutorials5
How to Disable External Access to Exchange Control Panel for Security
Secure your Exchange Server by blocking external access to the Exchange Admin Center using Client Access Rules or IIS IP restrictions to prevent brute force attacks.
How to Clean Up Exchange Server Logs Using PowerShell to Free Disk Space
Create and run PowerShell scripts to automatically clean up log files from Exchange 2013, 2016, and 2019 servers, freeing valuable disk space by safely removing old IIS, ETL, and Exchange logs.
How to Configure Microsoft Outlook with Exchange Server Using Group Policy
Deploy automated Outlook configuration across your organization using Group Policy Objects. Configure cached Exchange mode, autodiscovery, and Global Address List synchronization for seamless email deployment.
How to Configure Extended Protection in Exchange Server 2019/2016
Enable Extended Protection on Exchange Server to prevent authentication relay and man-in-the-middle attacks using PowerShell scripts and manual configuration methods.
How to Fix 550 5.1.10 RESOLVER.ADR.RecipientNotFound Error in Exchange Server
Resolve Exchange Server's recipient validation error that blocks email delivery to valid recipients when invalid addresses are included in multi-recipient messages.
Knowledge Base3
KB5074994 — Security Update for Microsoft Exchange Server 2019 CU14
KB5074994 is a February 2026 security update that addresses multiple vulnerabilities in Microsoft Exchange Server 2019 Cumulative Update 14, including remote code execution and elevation of privilege flaws.
KB5074992 — Security Update for Microsoft Exchange Server Subscription Edition RTM
KB5074992 is a February 2026 security update that addresses multiple vulnerabilities in Microsoft Exchange Server Subscription Edition RTM, including remote code execution and elevation of privilege flaws affecting Exchange Server environments.
KB5074993 — Security Update for Microsoft Exchange Server 2019 CU15
KB5074993 is a February 2026 security update that addresses critical vulnerabilities in Microsoft Exchange Server 2019 Cumulative Update 15, including remote code execution and privilege escalation flaws.
