Thx for the reply Antennipasi
But unfortunately it does not work
Perhaps a little more info is needed.
I running my server on OpenSuse 11.0 setup using this tutorial:
Everything works great including the email when default port 25 is used to send.
The problem is a 1 local ISP blocks port 25.
I uncommented said line and a client on blocked ISP and a client on ISP that is not blocked and a client on the same network as the server will not send (cant connect to server).
Clients can not send on port 25 either (except client on blocked ISP) until I re comment submission line and restart postfix, then clients on unblocked ISPs can send using port 25.
I have opend all ports in the servers firewall.