your port is taken. is it possible you have sendmail installed? what is the result of rpm -qa sendmail? if you are not using it you should delete it. check the how-to's at the postfix.org website. they generally tell you to uninstall sendmail before you try to install postfix.
rpm -e sendmail*
regarding configuration:
e.g. mail.yourdomain.com
your computer has to have a fully qualified domain name advertised. for example, dig mail.speakeasy.net. server's have to be able to find you. that means you have to have a DNS server with the correct entries, too.
Quote:
inet_interfaces = localhost
|
you are only listening on 127.0.0.1 (your local host for things like emails about system processes for the root user).
vi /etc/postfix/main.cf
(browse to the inet_interfaces = localhost setting and use the examples in the file to set up the correct interfaces to listen on. if memory serves there is an "all" option that should cover you if you have any doubts.
if you have other questions, you probably need to talk to someone who knows the program. go to postfix.org and find out how to subscribe to their maillist. the good news: your post will be answered by someone incredibly knowledgeable about the program; the bad news poorly worded questions will get you flamed).