What is the default outbound IP address used for MailEnable and how to it?
MailEnable has the ability to configure which IP Address is used to connect to remote mail servers and send outbound mail.
To access this parameter follow these steps:
Open Mailenable Administrator by either running
mailenable.msc(with Start > Run) or by finding MailEnable in the Programs section of the start menu (or start screen on Windows 2012).
Go to MailEnable Management > Servers > localhost > Connectors. Right-click on SMTP and choose Properties.
Switch to Outbound tab and select desired outbound IP address:
By default the first adapter/interface added to the computer is always used for outbound traffic.
For more infoirmation please refer to this article in MailEnable Knowledge Base: Outgoing IP address for Mail Delivery