It's spam; junk mail; think Publisher's Clearinghouse. Cut it up and toss it.

When you acknowledge that kind of garbage, you acknowledge that you do indeed live at that address. That info goes into a database and that gets sold to other junk mailers. Next thing you know you're getting every catalog and rip-off offer known to man.

For the love of all that's decent, walk away, man, walk away.

My 2¢