In some environments, two separate e-mail systems can share a single domain. The Forward Local Undeliverable Messages option in the NMAP Agent enables NetMail to run alongside any application that supports Internet standards, including groupware applications such as Novell GroupWise®, Lotus Notes, and Microsoft Exchange.
When the Forward Local Undeliverable Messages option is configured, the NMAP Agent forwards messages that belong to the domain but are not addressed to users within the NetMail messaging system. In the case of GroupWise, the destination server is running a GroupWise Internet Agent.
IMPORTANT: Do not forward local undeliverable messages on both mail systems; this will cause a loop if a message is sent to a user that does not exist on either system.
For more information, see the Forward Local Undeliverable Messages property in Configuring the NMAP Agent .