Scott,
Everyone is answering your questions. All good ideas. I think we are making this much too difficult. First, and I may be misinterpreting Sandeep's suggestion, but the Send As feature is designed so that one can send from another person's account and appear to look like them. But, email will come back to the original account.
I think I need to know more info. What server are you using? Are you using Outlook or Outlook Mail or Express? I, and I think others, are assuming you are using Exchange Server.
Please update your info.