TCP/IP Address for Outgoing SMTP

This setting determines which IP address will be used for outgoing SMTP connections. If left blank, then the first TCP/IP address on the machine or, if specified, the first TCP/IP address specified in the Multiple TCP/IP Addresses setting will be used for outgoing SMTP connections. If set to 1.0.0.0, the operating system will decide which address to bind to.

The text in the HELO command will be based on this setting. If 1.0.0.0 is specified then the first TCP/IP address as described above will be used to determine the HELO text. To set the HELO text, see Setting Server Options.

This setting is useful when you want to have ListManager send mail out on a different IP address than the ones it listens to. This is required in some configurations where multiple network cards are used.