If you receive a message like this .. DO NOT OPEN it contains a trojan horse virus.

If you are a Mac user it will have no effect but don’t forward it to friends with PC’s

Hello! 
Unfortunately we failed to deliver the postal package you have sent in time because the recipient’s address is erroneous. 
Please print out the shipment label attached and collect the package at our office. 
Thank you, 
USPS United Parcel Service of America, Inc.