If INBOUND is used in the SMTP Destination field, the rules specified here are used to route the inbound IP address to a different outbound IP address. You must specify a port number with the outbound IP address. This feature works by assigning as many IP's to ASSP as you have different receiving Mailservers. This can be avoided by using the advanced flow we recommend: Basic Workflow
Example:141.120.110.1=>141.120.110.129:25|141.120.110.2=>141.120.110.130:125|141.120.110.3=>141.120.110.130:125
Note: Requires ASSP restart