Deactivate new user email notifications

Hello!

I'm wondering how I might go about deactivating the email sent out when creating a new user account on a multi-site install. On the basic Wordpress install we have the option as to whether the person receives the mail or not, but not on multi-site, bummer!

I have a bunch of accounts to set up after a site migration, and I definitely don't want to bother these people with a bunch of emails.

Can someone clue me in?

thnx!
-jennyb