Set a domain alias for every user in Microsoft 365
Logging in Exchange Online Powershell
To configure a alias for every user, we need to login into Exchange Online Powershell:
Connect-ExchangeOnlineIf you don’t have the module already installed on your computer, run the following command on an elevated window:
Install-Module ExchangeOnlineManagementSource: https://www.powershellgallery.com/packages/ExchangeOnlineManagement/3.7.2
Adding the 365 domain alias to every user
After succesfully logged in, run the following command:
$users=Get-Mailbox | Where-Object{$_.PrimarySMTPAddress -match "justinverstijnen.nl"}Here our current domain is “justinverstijnen.nl” but let’s say that we want to add “justinverstijnen.com”. Run the following command to do this:
foreach($user in $users){Set-Mailbox $user.PrimarySmtpAddress -EmailAddresses @{add="$($user.Alias)@justinverstijnen.com"}}Now we have added the alias to every user. To check if everything is configured correctly, run the following command:
$users | ft PrimarySmtpAddress, EmailAddresses
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