Hi, I am new to exchange server and do not know the settings required to SMTP server to send the mails to other domains (like yahoo). There is no relay restriction and everone is allow to relay their mails. Btw, an important issue to consider is that, the machine where exchange server is installed is not directly connected to internet. Whenever I want to access internet (say from IE), I need to provide credentials. I am not sure, how can I provide such credentials in the SMTP server so that it can get connected to internet. Btw, I am using MS Exchange server 2003 on Windows server 2003. Regards...