Look at the links below the bugzilla window, you'll see
Edit->Parameters. Change the "maintainers" box.

>-----Original Message-----
>From: support-bugzilla-bounces@lists.mozilla.org
>[mailto:support-bugzilla-bounces@lists.mozilla.org] On Behalf
>Of DrBrain
>Sent: Tuesday, January 24, 2006 3:46 AM
>To: support-bugzilla@lists.mozilla.org
>Subject: How to change default postmaster@localhost account
>I guess this should be a trivial question but googling it
>didn't seem to help a lot. So, how is it possible to change
>the default postmaster@localhost address bugzilla is using for
>outgoing mails to something different? I tried the conf files
>but didn't seem to include such a setting.
>support-bugzilla mailing list