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This page shows neat tricks for powershell within exchange to get interesting information (one liners)
Find users that are auto forwarding /redirecting their email
'get-mailbox -Filter { ForwardingAddress -like '*' } | select-object Name,ForwardingAddress'- finds all addresses with the forwarding address set in exchange management
'$mbox = Get-Mailbox; $mbox | Foreach { Get-InboxRule -Mailbox $_ }'- finds inbox rules that forward to other users