I agree, this is not possible as in all server based solutions the server uses a technical account to distribute this kind of information. It would be a security breech and otherwise problematic if a server could pretend to be a person and send mails in their name. The information who did the change usually is in the mail content.

There is a Rational application called ClearQuest, which does exactly what Gagan wants: It uses the mail from the logged in user to send the mail notifications.
And that is the only reasonable way.
Because the user who is changing the owner of an workitem in RTC will get the ooo message directly, if the new owner is away.
No wondering weeks ago, why a workitem didn't change or so.
I think there is a RFE regarding this issue.

 George 

No, CLM/RTC is not an upgraded version of neither CC/CQ or Synergy/Change. It (RTC) was in fact developed to support agile development and not to be a replacement of any of the aforementioned tools. Ay assumption "Because it was in tool XYZ it has to be in CLM" is basically plain wrong and you should never assume this.

Of course, RTC isn't a replacement of CQ or Change.
But if you have both systems in parallel (CQ and RTC on our site) the users are confused.
Changing the owner of a CQ record leads to an out of office mail to the editor, and he/she can react (changing the owner, changing the time planning,...).

Changing the owner of a RTC record doesn't lead to an out of office message to the editor, so the editor can't react.