how do I change the mass email sender default email address?

I just installed and tried out the mass email sender plugin. I noticed that when I sent an email out, it also sent to my support email, which auto replied to itself.

I have a feeling that’s set in the q&a plugin to auto reply or somewhere in my settings somewhere. I have 3 different emails set up in different places and want to hone it down to 2. management or admin, and support. Where does the mass email program get its email address from?