How can I send this email but in order to protect a person?

[lela]

There's this boy in my family who I think is being abused by one of my uncles. That uncle is his grand-father. Now how can I send a message via facebook or email to the boy's father, to tell him what's happening...but in a way that's anonymous so he can't track where the email is coming from? Thanks.

[toby]

Just create an anonymous GMail account. GMail is the only major e-mail provider that doesn't include your original IP address in the header of the message.