How can we change the From Field and email address when client receives a message from contact form?

I am using a theme that comes with a contact form. When my client receives an email from that contact form, he sees int he From field of his inbox: "Multisite name" and in the email he sees "Multisite name" followed by "multi site admin email address".

Is there a plugin to change that^ Or another general plugin that I can use as a contact form that would resolve this issue? I looked at your contact plugin, but it seems to only be a widget. I would like to have the contact form on the contact page.

Thanks for your help,