Save a copy of sent mail items when using Send As permissions

For a single user

Set-Mailbox -Identity <identity> -MessageCopyForSentAsEnabled $True
Set-Mailbox -Identity <identity> -MessageCopyForSendOnBehalfEnabled $True

For all users

Get-Mailbox | Where {$_.RecipientTypeDetails -eq “SharedMailbox”} | Foreach-Object {Set-Mailbox -identity $_.Alias -MessageCopyForSentAsEnabled $True }

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