How to stop sending computer name along with the mail?

When sending an email from Lotus It attaches the computer name on which the lotus server is running.

At the same time when sending delivery failures also it is attaching the computer name like the example I gave below.

Reporting-MTA: dns;mydomain.com

Received-From-MTA: dns;server123.mydomain.com

Arrival-Date: Fri, 13 Jun 2003 22:23:29 -0700

How can we stop lotus diclosing our computer name to the outside world.

Is there any way that it send an alias name ??

Please try to help me out if there is any solution with u?

Cheers!!!