E-mail and sender

Hi! First of all thanks for this really useful plugin.
I have a question: is there a way to define the Sender and the e-mail from which the invitations are sent? At the moment all the invitations are sent from “WordPress” unsing an email like “wordpress@mydomain.com”. I tried checking all the code, but couldn’t find anything.

http://wordpress.org/extend/plugins/invite-friends-to-register/