I am using this module for sending newsletters to a website. Everything is fantastic and works well enough.

The problem I have is to change the direction that sends these e-mail.

Now when I receive a newsletter appears:

"SITENAME@cpanel2.SERVER.com"

and need not appear el@cpanel2.SERVER.com

Does anyone know how or where I could modify this value?
In the configuration options, Sender email address I put info@server.com but still set anything else.