Hi Mohammed,

Is this in a custom module?  If so, check out your drupal_mail arguments-- http://api.drupal.org/api/function/drupal_mail/5. eg, for d5
drupal_mail( $id, $to, $subject, $body, $from);
//or further customization
drupal_mail( $id, $to, $subject, $body, $from, array('From'=>$from, 'Reply-To'=>'bulkemail@mydomain.com') ); //add in bcc, content-type, etc.

If not, this might be a server setting not a drupal setting--what's your stack setup, have you looked there?  You could always grep nobody@host.domain.com too.

Best,
Tim

On Mon, May 18, 2009 at 6:27 PM, Greg Knaddison <greg.knaddison@gmail.com> wrote:
I suggest http://drupal.org/project/returnpath

If nothing else the project page provides some guidance.

On Mon, May 18, 2009 at 4:22 PM, Mohammed@atexplorer.com
<mohammed@atexplorer.com> wrote:
> how do I modify the mail headers that are sent by Drupal? for some reason
> emails sent from my installation have the sender as nobody@host.domain.com.
> note that I have specified a valid email address under site configuration /
> site information.

Regards,
Greg

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