I use sendmail to send mails. I am not able to send mail to domains other than mine . i.e if I try sending a mail to yahoo account , it doesn't go but it can recieve from yahoo domain. I am very new to all these and I don';t know how can I make it work. This is very improtant to me as I have a webserver running and I need to send mails to lot of people in other domains regularly. I was always assuming that my mails are reaching them but recently got to know it's not. Please help me.