Try first to send an email to a local account, using a local account.
Test the connection "to the Internet" by establishing a connection
to a known mail server on port 25, which is the only port required
at the moment.
Thanks now it seems like my SMTP Server cannot connect to any mail server on port 25 so it cannot send e-mail to the internet . So i'm going to request to the network guy to open port 25 for my server and i hope that will make the server to be able to send mails to internet ...