Use my domain name

Hi, I am new to Zoho and have a question.. First of all I LOVE YOUR PRODUCT it is a refreshing alternative to G**** and Out****.

QUESTION: I have paid for my own domain through Zoho. PROSECINC.COM However, I want it to be transparent to the users when they go to url: mail.prosecinc.com it is forwarded to a Zoho url.

Thanks,

Robert