NDR sent to internal users of List Server
Internal users receive a non-delivery report when sending emails to list server. This issue typically occurs when GFI MailEssentials is installed on a GatewayThe computer (server) in a LAN that is directly connected to an external network. In GFI MaiEssentials, gateway refers to the email servers within the company that first receive email from external domains. machine.
The list server email address does not exist in the Microsoft Exchange store, and thus, internal messages generate an NDRNon Delivery Report.