I have searched high and low for a solution to this, but nowhere can I find an answer.
No matter what I do, I can not get the from fielf of any of my forms to respect what I enter into it. It is simply overruled by wordpress multisite's default of making the from field the name of the website.
It is the equivelent of emails being sent from "wordpress" in a single site install.
I have tired deactivating multisite (which is not a solution at all really) and the from field started working as expected.
The closest thing I could find to an answer was here:http://premium.wpmudev.org/forums/topic/problem-using-wp_mail-function-in-wpmu but alas I don't have the first clue how to implement such a thing.