The default behaviour for items sent from a shared mailbox is to go into the users sent items. We had a requirement to save a copy in the shared mailbox sent items folder.
this script modifies the mailbox so that email sent either “on behalf” or “as” the mailbox get copied into the shared mailbox’s sent items:
$mailboxes = get-mailbox -resultsize unlimited -RecipientTypeDetails SharedMailbox foreach ($mailbox in $mailboxes){ write-host "trying " $mailbox.DisplayName -ForegroundColor Green try{ set-mailbox $mailbox.displayname -MessageCopyForSendOnBehalfEnabled $True set-mailbox $mailbox.displayname -MessageCopyForSendOnBehalfEnabled $True} catch{ write-host "An error occured on " $mailbox.DisplayName -ForegroundColor red } }