Interfaceaddress, port Channel Options

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TCP/IP port number and interface address (interfaceaddress, port)

SMTP over TCP/IP channels normally connect to the remote system's port 25 when sending messages. The port channel option may be used to instruct an SMTP over TCP/IP channel to connect to a non-standard port.

The interfaceaddress channel option controls the address to which a TCP/IP channel binds as the source address for outbound connections; that is, on a system with multiple interface addresses this channel option controls which address will be used as the source IP address when the MTA sends outgoing SMTP messages. Note that it complements the Dispatcher option INTERFACE_ADDRESS, which controls which interface address a TCP/IP channel listens on for accepting incoming connections and messages. Also note that such channel interfaceaddress settings are quite separate from the Job Controller's own INTERFACE_ADDRESS setting, which merely controls what IP address the Job Controller listens on for purposes of its own, internal communications.