原因知道了:
Get-ReceiveConnector "Client*"|Add-ADPermission -User "authenticated users" -ExtendedRights ms-Exch-SMTP-Accept-Authoritative-Domain-Sender
Get-ReceiveConnector "Client*"|Add-ADPermission -User "authenticated users" -ExtendedRights ms-Exch-SMTP-Accept-Authoritative-Domain-Sender