I got this one today and checked it out before opening the attachment - never did open the attachment because it is a virus spam email.

I could tell it wasn't a legit email from USPS because of the way it was worded , but I wanted to know if there was info online about this same type of message. There was.
http://www.snopes.com/computer/virus/ups.asp

subject- Delivery information contains at the postal label (me =)

[Postal notification,

Courier service couldn’t make the delivery of your parcel.
Reason/The weight of parcel is exceed the available parameters for free delivery.

LOCATION OF YOUR ITEM:Lexington
STATUS OF YOUR PARCEL: not delivered
SERVICE: Standard Shipping
NUMBER OF YOUR ITEM:U314500427NU
FEATURES: No

Label is enclosed to the letter.
Print your label and show it at the post office.

Attention!
If the parcel isn’t received within 30 working days our company will have the right to claim compensation from you for it's keeping in the amount of $3.34 for each day of keeping over limited time.

You can find the information about the procedure and conditions of parcels keeping in the nearest office.

Thank you for attention.
USPS Logistics Services.]




So if you get any odd messages like that just mark them as junk and/or delete them right away.