An email system based on on-premises Exchange Server or Exchange Online (Microsoft 365) allows an administrator to block (reject) e-mails from specific external domains or sender addresses. There are several features in Exchange Server and Microsoft 365 that you can use to create a blacklist of unwanted domains and email addresses from which you want to block incoming e-mails. In this article, we’ll look at how to configure a blocked senders list from the Exchange Admin Center (EAC) GUI or from PowerShell.
Windows Server: Administration Guides
Step-by-step tutorials and comprehensive courses covering Windows Server installation, configuration, administration, and management. Learn to deploy server roles, manage Active Directory, configure networking, automate tasks with PowerShell, and implement security best practices for Windows Server 2012, 2016, 2019, and 2022 editions. Ideal for beginners and IT professionals seeking practical, hands-on knowledge to master Windows Server environments.
Windows 10 and 11 Tutorials for System Administrators
Guides and technical tutorials for system administrators, focusing on the configuration, deployment, and management of Windows 10 and Windows 11 desktop operating systems. Step-by-step instructions on installation, deployment, policy configuration, security hardening, and administrative tools to optimize Windows enterprise environments.
Group Policy (GPO) Guides for Admins
Clear, concise tutorials on creating and managing Group Policy Objects to control user and computer settings, enforce security, and streamline network administration in Active Directory environments.
- Configuring Firewall Rules With Group Policy
- How to Copy Files or Folders to All Computers with GPO
- Updating Group Policy Administrative Templates (ADMX) Files
- Active Directory Password Policy
- Applying Group Policy troubleshooting guidance
- Deploying printers via GPO
- Running PowerShell scripts using Group Policy
- Local Groups Policies export and import on Windows
Active Directory: Setup, Configuration, and Best Practices
Step-by-step tutorials and comprehensive resources for installing, configuring, and managing Active Directory Domain Services (AD DS). Learn how to set up domain controllers, design forest and domain structures, create users and groups, and implement security best practices.
- Updating AD Group Membership Without Restart or Logoff
- How to Detect the Source of Account Lockout in Active Directory
- Adding an Additional Domain Controller To an Existing AD Domain
- Active Directory Health Check
- Get-ADDomainController: How to Get Domain Controller Information with Powershell
- How to Transfer os Seize FSMO Roles in Active Directory
- Active Directory Backup Best Practices
- How to Reset Domain Admin Password in Active Directory
- Fix Trust Relationship Failed Issue without Domain Rejoining
- How to Extend Password Expire Date in Active Directory
- How to Find Inactive Accounts in Active Directory
Enterprise Virtualization Platforms
Expert guides and tutorials for system administrators on VMware, Hyper-V, and Proxmox virtualization. Covering installation, configuration, management, and optimization to build robust and scalable virtual environments.
PowerShell Scripting Tutorials
Practical guides to automate and manage a wide range of IT tasks using PowerShell. Learn how to streamline system administration, Active Directory, network configuration, software deployment, Microsoft 365 management, and more through powerful scripting and cmdlets.
VMware:Install and Configure Guides
Detailed walkthroughs for installing VMware ESXi, vCenter Server, and VMware Workstation Player, including configuration of virtual machines, network settings, and storage options to optimize your virtual infrastructure.
- VMware ESXi: Create VMFS Datastore on USB Drives
- Configuring iSCSI Datastore on VMware ESXi
- Add Drivers into VMWare ESXi Installation Image
- Adding Sound Controller to a VMWare VM
- Using Free VMware vSphere Hypervisor
- Adding an ESXi host to the VMware vCenter (vCSA)
- Reset VMware ESXi root password
- Disable the Virtual Machine Auto Suspend Feature in VMware Workstation/Player
- Azure and Microsoft 365ExchangePowerShell
Managing Inbox Rules in Exchange with PowerShell
March 15, 2024Outlook mailbox rules allow users to configure different conditions for processing incoming e-mail messages in the Inbox folder. You can use Outlook rules to move e-mails from specific senders to…
- PowerShellWindows 10Windows 11
How to Uninstall or Disable Microsoft Edge on Windows 10/11
June 8, 2023The Microsoft Edge browser is installed by default on Windows 11 and all new Windows 10 builds (and Windows Server 2022/2019). If you have another browser installed on the computers…
- Azure and Microsoft 365ExchangePowerShell
Convert a User Mailbox to a Shared in Exchange and Microsoft365
March 15, 2024Multiple users can access a shared mailbox in Exchange. Unlike a common user mailbox, a shared mailbox account is disabled in Active Directory and cannot be used for interactive sign-in.…
- Active DirectoryGroup PoliciesWindows 10Windows Server 2019
How to Add, Set, Delete, or Import Registry Keys via GPO
June 8, 2023In this article, we will look at how to use Group Policy (GPO) to centrally create, modify, import, and delete any registry keys and parameters on domain-joined computers.
- PowerShellWindows Server 2016Windows Server 2019
Configuring User Profile Disks (UPD) on Windows Server RDS
March 18, 2024User Profile Disk (UPD) allows you to store the profile of each Remote Desktop Services user (%USERPROFILE%) in a separate VHDX (virtual disk) file. Such a profile disk is connected…
Modern builds of Windows 10 and Windows 11 come with the Microsoft Edge browser preinstalled, which should replace the deprecated Internet Explorer (how to remove IE on Windows). Some users…
- Active DirectoryGroup PoliciesWindows 10Windows Server 2019Windows Server 2022
Configure User’s Folder Redirection with Group Policy
March 15, 2024Folder Redirection enables you to store some user profile folders (special folders like Desktop, Documents, Pictures, Downloads, etc.) in a shared network folder on your file server. Redirected folders work…
The Microsoft Edge browser is used by default to view PDF files on Windows 10 and 11, even if you have another program installed on your computer to open the…
- PowerShellWindows 10Windows 11Windows Server 2019
Using Previous Command History in PowerShell Console
March 17, 2024By default, Windows saves all of the commands that you type in the PowerShell console to a text log file. This allows you to re-run any command and view the…