I have managed to set up a fedora 1 core server with sendmail. It has been working better than the exchange server I had before, I had recently stumbled under this problem that when I add a new user that user can send out emails to the internet accounts only(ex. yahoo,msn,etc) only I tried to some local accounts and no error messages neither. Other users have no problems with sending and recieving mail can any one give me a hint on what could cause this. Thank you.