Automatic e-mail "From:" addresses

On a WordPress Multi-site installation how do I edit the From and Reply-to addresses on automated e-mails?

When someone posts a comment, it sends an e-mail for moderation and the "From" line shows the main site title, and the description shows the originating site. How do I change it so the "From" line will say the title of the originating site.

Example:

From: Main Site, Subject: [Origniating Site] Please moderate: "New Comment"

I am also running the subscription plugin and it is doing the same thing. When it sends a new post announcement it is listed as From: Main Site.

I would like the e-mails to appear as From: Originating Site