Ok, not sure if this will work, but it might.
Step 1. Go to the Auction House and find an epic that is being sold.
Step 2. Write down the Buyout amount, Item being sold, and the name of the seller.
Step 3. While at the Auction House, buy a cheapy recipe or something with a scroll for it's tooltip. (Like the one you recieve when an auction has been succesful)
Step 4. Go to your mailbox and create a letter to <Seller's Name>.
Attach the recipe as the Item being mailed.
For the title put, this: Auction Succesful <Item being sold's name>.
Finally, for the C.O.D. Put the <Buyout Amount>.
Step 4. Sit back and wait, if they are not paying attention they will see the Auction Succesful title, and the picture of the litte scroll and will click it thinking that the phat lewt they had has been bought out!!
I'm not big on scamming after being banned a couple times for it, but if someone could give this a try and post how well it works I would Appreciate it!