Forwarding Email Addresses with MobileMe

I have a Email forwarding account through Go Daddy that I use for my business Emails. Currently I have it forwarded to my Gmail account and Gmail allows me to reply back from that Email address. I understand that MobileMe now allows you to reply back from the Email address the original correspondence was sent from, however, will it allow me to reply back with a forwarding Email address or do I need a POP Email address to do this with? If so, do I need to set it up in the MobileMe Email accounts for that Email address??

Thank You-

rolandy