the theory is yes. it should work. im hosting my domain on
Zone Edit and they are forwarding all my mail via MX record to my IP address, and then my router sends all port 25 mail to my mail server. im not running Exchange at the moment, but it should work as most mail servers. just get it to accept mail for your domain and you should be grand. thats all i did. Good luck! BTW, zoneedit is a good place to try out. if you can get away from your current domain hoster. I would also advise looking at MX Backup just in case your home server goes down for any amount of time, or your internet connection dies for a while.