sendmail转发到另外一台邮件服务器？？？？

lifewise

1。Q：公司已经有邮件服务器，现在想在sendmail里设定直接将邮件转发到邮件服务器，怎么设定呀？
我在submit。cf中
# "Smart" relay host (may be null)
DSdbatest
设定了邮件服务器地址，可是邮件还是根本没有转发到邮件服务器

d=<200711050801.lA581taQ008566@data2.got.com.cn>, relay=root@localhost
Nov  5 16:01:55 data2 sendmail[8566]: lA581taQ008566: to=lig@163.com, delay=00:00:00, mailer=relay, pri=30027, dsn=4.4.3, stat=queued


2。LOCAL_NET_CONFIG
# This rule ensures that all local mail is delivered using the
# smtp transport, everything else will go via the smart host.
R$* < @ $* .$m. > $*        $#smtp $@ $2.$m. $: $1 < @ $2.$m. > $3
谁能解释一下上面这句话什么意思呀？

lifewise

?????????