I'm installing a second GWIA for the sole purpose of keeping scanner and forwarded fax traffic from crossing the WAN to our main GWIA just to get emailed to a local user's mailbox.

Just wondering how to respond to the install prompt entitled "Relay Host" that wants me to choose between "Send outbound mail directly" or "Send outbound mail through a relay host".

I don't want to send any mail to the Internet through this GWIA, but for the purposes of this prompt I tend to guess I should select the first option.

True or not true?

Any other tips I need to know in order to deviate from the conventional role of a GWIA?