If you find that you can't deliver mail to certain addresses later on
(AOl.com, Attbi.com, comcast.com) then you can think about either
switching to a smarthost or adding some mailertable entries to hand
off those domains to your ISP's smtp service.
For now it makes no sense to change anything since its not causeing a problem.
better type "mailq" to see if it's causing a problem - also check your postmaster mailbox for rejections.
Joe