When a letter arrives in Wyoming, it will be opened, scanned, and then posted to a password-protected website. At the same time, you will be notified by email that a letter has arrived.

However, you may need to receive the actual letter, especially if it is the title to a vehicle. In this case, contact the service and supply a mailing address where it is to be sent. The cost for each letter sent by snail mail is an additional $15.

The service is US$ 20 per month.  

You can sign up with the link. Just chose mail forwarding and Wyoming. 

Wyoming Ghost Address