nothing weird on those.
configure submission like this:
submission inet n - n - - smtpd
and restart postfix.
then, from localhost, telnet those ports like in http://www.howtoforge.com/perfect-server-opensuse11-p4
you should get pretty much same answer from both 25 and 587. if not, try to look from logs what went wrong in restart. if yes, try telnetting from other computer and see if everything works from outside too.
if yes, try mailing. if it works, it works.
if still not working, post errors here, and i try to figure out what is the problem.