Change email address Network Admin emails come from

Howdy,

I am wondering what I am missing when trying to change the email address that Network admin emails come from!

Under Network Settings, the email address is admin@domain.edu.au (domain blanked). Yet the emails all come from wordpress@domain.edu.au. They also appear as from "Wordpress" as the email sender... is it possible to change this so they appear as from my site name? I find most of the users automatically delete things from Wordpress as they dont know what it is, then tell me they haven't got any emails from their blog.

Cheers,

Dale