Just an FYI for you all.
I received today in my spam box of my Yahoo mail a nondelivery notice from the USPS (spoof ofcourse) with 2 attachments.
As I found it very suspicious, I scanned it with ClamXAV and it detected that it was in fact a trojan virus! The payload (USPSlabel.zip) is a zip file with an executable file inside. (LABEL_USPSXLS.exe)
This is my very first virus of this fashion through my email. SPOOKY!
Just wanted to post this to warn you good people of this.
That one's been making the rounds for quite a while. I have been getting about fifteen copies of that particular malware a day on one of my email addresses.