I just opened this website yesterday, it gives you the ability to send fake emails to anyone, from anyone, saying anything. There is a 3 email limit to stop spamming and is refreshed every 24 hours.
An example of a fake email may be from bgates@microsoft.com to a friend, try it out, see if you can trick someone.
If it's a gag, it may work in the short term...but a large percentage of emails will end up in spam filters just because of SPF records. I'm not an expert on the subject of SPF records by any stretch, but someone like Microsoft would surely have one.
but your design is too simple. If you are thinking of going commercial you must spice it up a bit.
