Forward rule for all users

[TH_]

Hi everyone,

Looking for a clever way to set up a forward rule (all incoming traffic) for all our users from one tenant to another due to a recent acquisition. Was wondering if anyone knows of a powershell script or something similar to accomplish this? Thanks!

[#2 · Accepted solution]

Most third-party t2t migration tools have some way to redirect mail flow, that should be your go-to option. Other than that, PowerShell is your friend - simple loop over all mailboxes, and set the forwarding address to the corresponding @newtenant.onmicrosoft.com address.

[#3]

@Vasil Michev 

I simply created a csv with UPN and the ForwardToAddr and imported that in the script below. Seems to have done the trick.

$users = import-csv '.\UserMailboxes.csv'
foreach ($user in $users)
{
    Set-Mailbox $user.UPN -ForwardingSmtpAddress $User.FWD -force
 
    Write-Host "$($user.UPN) now forwards to ($user.FWD)"
}
$users = $null