Please be aware of a new scam doing the rounds re domain names.
See the image below to really see how clever they can be.
You will see that they use your domain name information available online and then issue this letter with a similar domain name, but at a hugely over the top fee.
Rest assured you can simply throw this away.
If you are unsure, feel free to contact me to help clarify the situation.
They also come from the USA, but as you can see in this case, Melbourne