Hi, I'm a newbee so i may post stupid things. I have few sites hosted on my Centos. IspConfig configured them and all seems ok. However, I cannot send email from an Outlook client. Is in the same network, i can connect to my mail server but I cannot send or receive emails. i get this on the root account Code: (reason: 550 5.1.1 User unknown) A friend tried to explain to me how to setup the users so that they could send/receive emails but I didn't exactly understand. He also created another type of user with different privileges. Now, what shall I show you from my wonderful Linux configuration??? I have no GUI so my Linux for Dummies book is not helping me much.(and I have to learn as you did) Thanx in advance for help.