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I ran the same command on two different machines one of them is working but not the second one. Can any one suggest me to sort out the issue?
There are obviously differences between the two machines...what are they? Right off the bat, it would seem obvious that you have sendmail/postfix RUNNING on one machine, and not on the other. Have you checked?
Yes,Postfix has been enable and running on both machines.
Ok, you are STILL MISSING THE POINT. There are DIFFERENCES between the machines...so figure out what they are. Are they on different networks? Have you checked the postfix configurations on both? Checked the mail logs? ANYTHING???
It's not pleasant playing a guessing game, with you giving very vague answers one after the other. Go back to the start of this thread, and re-read the replies so far. Do diagnostics, and post results.