Need to send mail using mail command

view story

http://www.unix.com – Hi Guys, Am tried with the mail & mailx command to send mail to other localhost machine, Which are all connected in a LAN. I can not able to send, Either it wont display any error message at that time and later am receiving a failure mail.. But i can send and receive (from-to) in my machine.. What is the problem with that? Shall i need to configure any packages for this.?? Please help me ASAP! --- Thank you!! (HowTos)