inet_interfaces question

Here is what I currently have:

inet_interfaces = $myhostname, localhost

I am adding 2 more NICs on this machine that I need to have postfix
'listen' in on and I presume that I simply have to add the IPs here...

My actual question here is as follows:

If I login into the postfix machine (using my shell account) and create an
email to send...when postfix gets this email what inet_interface does it go
OUT on when there are 3 or 4 of them?

Which is the default?

Thanks -



--
J.D. Bronson
Aurora Health Care // Information Services // Milwaukee, WI USA
Office: 414.978.8282 // Email: jd@aurora.org // Pager: 414.314.8282