email sender

Hi guys and girls

Quick question when my site http://www.motortrader-insurance.com send out emails they are sent from the follwoing

“wordpress@motortrader-insurance.com; on behalf of; One Bear Media [enquiries@onebear.co.uk]”

i would like it to read “enquiries@onebear.co.uk” or simply “One Bear Media”

Is there anything i can change or do i need a plug in?

oh i also use visual form builder pro not sure if that makes a diffrence??

Thanks for the help in advance

Jon