The Symantec Messaging Gateway (SMG) installation guide v9.5 incorrectly limits the number of Inbound Local Mail Delivery hosts. Table 1-3 of the Installation Guide implies that the limit for Inbound Local Mail Delivery Hosts is three hosts. The SMG appliance can be configured with a functionally unlimited list of Local Mail Delivery hosts following the initial bootstrap configuration.
This is a documentation issue and does not affect the operation of the SMG product. Documentaion of Inbound Local Mail Delivery configuration will be updated and corrected in a later release.