Thanks for your reply. I typed EHLO mydomain.net, EHLO server.mydomain.net, EHLO localhost, AUTH LOGIN... and nothing happens.
I also tried: o myserver.mydomain.net on telnet prompt and this is what I could see:
telnet: connect to address 172.16.xxx.xxx: Connection refused
telnet: Unable to connect to remote host: Connection refused
The smtp is listening and both iptables and selinux ar off..what can I do? Thanks