"For one week only (Nov. 10-16, 2014), we invite you to type a message to anyone— family, friend, secret crush, or congressional representative— and send it to us. We'll then handwrite your message and post it via regular mail to the recipient of your choosing, for free!" Don't know what (if any) the catch is, or the practicality of such service, but intriguing nevertheless.. http://snailmailmyemail.org/
Letters are usually not sent through snail mail without postage the creators name is a clue: Ivan Cash. This is their Privacy policy: While we aim to protect your privacy, please realize that this is a large-scale project that outsources to volunteers all over the globe. We therefore have only limited control over the information you give and hold no responsibility for its misuse.