I am using the mailx command of Unix through which I am able send mails but the problem is the from mail ID is automatically buit by unix as the (UNIX Box Name:---------------------------------) to mask the from id the option used by mailx is –r but for some security reasons this is blocked by the client. So is there any other way through which the from mail id can be masked to a valid email id ?
The example of how the mail looks when its sent :

-----Original Message-----

From: Support1 rsetl () [mailto:billset@qdcb204.mobe.becom.be]
--------------- This thing has to be masked to valid email id

Sent: 05 February 2004 15:12
To: RISHNAN (BMB); Pi_M@info.com;
Subject: Electronic Document: CO flow : 200401


Kindly please help.

Thanks for u r time and patience .


Many Thanks
Narendra babu

If you can use sendmail instead of mailx command then we have the post here sendmail