[nos-bbs] SMTP gateway

[Lakenet]

I have always set SMTP gateway to none not knowing how to use that gateway. 
Recently I read a reflector post that the gateway should be set to the 
address of the home router I assume to route unroutable mail out into the 
internet. I understand that any packet mail with no route to deliver would 
go to the SMTP queue. So I entered a gmail address from within JNOS for a 
test and the mail did get to the recipient. I did not see anything on the 
monitor. How does this operation run? Does ampernet have some type of mail 
handler? Does anyone know if there is something written to explain this 
operation or can someone type me a simple explanation.

Thank you,

Jerry, N0MR