Remove a list of domains from all users' Outlook Blocked Senders list

From Exchange PowerShell:

# For every user mailbox, remove blocked senders with domains in $approvedDomainList $approvedDomainList = "gooddomainexample1.com","gooddomainexample2.com","gooddomainexample3" $user= Get-Mailbox -ResultSize unlimited -Filter {(RecipientTypeDetails -eq 'UserMailbox')} | Select Identity $user | ForEach-Object { if ($blockedDomains = ($_ | Get-MailboxJunkEmailConfiguration).BlockedSendersAndDomains | Where-Object {$_.Split('@')[1] -in $approvedDomainList}) { $_ | Set-MailboxJunkEmailConfiguration –BlockedSendersAndDomains @{remove=$blockedDomains} Write-Host "Removed the following address(es) from {0}'s blocked list:`n`t{1}" -f $_.Name,($blockedDomains -join "`n`t") } }