Postfix smtp not accepting connections
 

I have a Mandrake 10.1 installation running Postfix as the MTA

telnet 127.0.0.1 25 connects to Postfix SMTP agent correctly

telnet localhost 25 connects and hangs

telnet domain.com 25 and telnet x.x.x.x 25 refuse connection

I have set up main.cf with the mydomain and myhostname flags as well as the:
mydestination = $myhostname, $mydomain, localhost.$mydomain, localhost
line

Also, the smtp process is shown to be listening with
netstat -t -a | grep LISTEN

tcp 0 0 *:smtp *:* LISTEN

Internal mailing works fine, also I can male OUT from my domain, nothing gets in from the outside

Please help me :)

Cheers, Shaun