[opensuse] Help With Mail Server

I want to setup the mail server so when you send an email to
<localusername>@<domain with MX record set to this machine> it gets
delivered (instead of bouncing) and I've done the following setup:

In YaST2 -> Network Services -> Mail Transfer Agent I used the
following options:

*Standard Configuration Type
*Permanent Connection
*Virus scan: unticked (disabled)
*Outgoing Mail Server: (blank)
*Accept remote SMTP connections: ticked (enabled)
*Firewall is disabled

But I can't even telnet to port 25 on this machine:

root@srv04 [~]# telnet app5.SuSELinuxRocks 25
Trying 74.420.420.420..
telnet: connect to address 74.420.420.420 Connection refused
telnet: Unable to connect to remote host: Connection refused

I can telnet into localhost:

app5:~ # telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 app5.SuSELinuxRocks ESMTP Postfix

I even tried to edit /etc/postfix/main.cf the line inet_interfaces=all
was commented out so I uncommented it and issued the command 'service
postfix restart' and still I cannot telnet into port 25 (or receive
actual email that an MTA tries to deliver to the server)

So the question is how exactly am I supposed to enable the MTA on the
external interface. FWIW I haven't had an issue getting local mails
(cron reports and such.)

I'll admit I'm not an expert on MTA's. All my life I've gone the easy
route (Xmail sever, cPanel, Scalix, etc) and always been afraid of
getting "down and dirty" with the configfiles and such. The most I've
down is edit config files when using "how-to" guides on how to add
virus protection and such or doing what cPanel support says needs to
be done to fix the issue (usually running one of their scripts).
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