if (-NOT (Get-Module -ListAvailable -Name ExchangeOnlineManagement)) {

Install-Module -Name ExchangeOnlineManagement

}

Import-Module ExchangeOnlineManagement

$admin = Read-Host "Exchange admin email or UPN"

Connect-ExchangeOnline -UserPrincipalName $admin

$users = Get-User

$senders = 'ch-account-2fa.com', 'ch-contact-us.com', 'ch-login-created.com', 'ch-password-reset.com', 'ch-security-alert.com', 'cyberhoot.com' #add safe senders here, in quotes and comma-separated

foreach($user in $users){

$out = 'Adding Trusted Senders to {0}' -f $user.UserPrincipalName

Write-Output $out

Set-MailboxJunkEmailConfiguration $user.UserPrincipalName -TrustedSendersAndDomains @{Add=$senders}

}

Write-Output "Finished!"