I get a lot of urban legend and hoax emails, and I usualy try to teach the sender how to check things out before they forward something. But sometimes, when the people don't care and just keep sending stuff, I just reply-to-all (and try to include as many people from previous forwards, becasue they're usually still there in the message, of course). This is a reply I just made to a "Obama called for Muslim Christmas stamp!!!1!1!!" message:
The message below is built of lies, misunderstandings, and what seems to be most of the world's remaining supply of exclamation points. Please see:
http://www.snopes.com/politics/stamps/eidstamp.asp
if you care to know the truth.
Please, for the love of all that is good and truthful, check these things out before you forward them on. Do you want to be someone who increases the amount of lies and misunderstanding in the world? What is the cost of these messages, in time wasted, in people not having the right facts, in people getting angry and maybe taking some action based on a lie you've told them?